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Dr. Maximilian Nickolsky
Institute of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS

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0 Crystallography
0 Diffraction
0 TEM
0 XRD
0 crystal chemistry

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Research papers
Published: 16 July 2021 in Journal of Applied Crystallography
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Vacuum heat treatment of mechanically alloyed powders of boron and aluminium leads to the formation of a metastable Al-rich phase, which can be quenched. Its structure, composition and thermal stability are established. With the chemical formula Al1.28B the rhombohedral phase is unusually rich in Al. The parameters of the unit cell determined from X-ray powder diffraction are a = 18.3464 (19), c = 8.9241 (9) Å, V = 2601.3 (6) Å3, space group R 3. It is stable on heating to 630°C. It is suggested that this phase is an important intermediate step in the formation of AlB2 and, eventually, of other borides; its nucleation and thermal stability are explained by high elastic energy hindering the formation of equilibrium phases at low temperatures.

ACS Style

Alexander I. Malkin; Vladimir V. Chernyshev; Alena A. Ryazantseva; Alexander L. Vasiliev; Maximilian S. Nickolsky; Andrei A. Shiryaev. Formation and characterization of an Al-rich metastable phase in the Al–B phase diagram. Journal of Applied Crystallography 2021, 54, 1121 -1126.

AMA Style

Alexander I. Malkin, Vladimir V. Chernyshev, Alena A. Ryazantseva, Alexander L. Vasiliev, Maximilian S. Nickolsky, Andrei A. Shiryaev. Formation and characterization of an Al-rich metastable phase in the Al–B phase diagram. Journal of Applied Crystallography. 2021; 54 (4):1121-1126.

Chicago/Turabian Style

Alexander I. Malkin; Vladimir V. Chernyshev; Alena A. Ryazantseva; Alexander L. Vasiliev; Maximilian S. Nickolsky; Andrei A. Shiryaev. 2021. "Formation and characterization of an Al-rich metastable phase in the Al–B phase diagram." Journal of Applied Crystallography 54, no. 4: 1121-1126.

Review
Published: 03 May 2021 in Minerals
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A significant part of the primary gold reserves in the world is contained in sulphide ores, many types of which are refractory in gold processing. The deposits of refractory sulphide ores will be the main potential source of gold production in the future. The refractory gold and silver in sulphide ores can be associated with micro- and nano-sized inclusions of Au and Ag minerals as well as isomorphous, adsorbed and other species of noble metals (NM) not thoroughly investigated. For gold and gold-bearing deposits of the Urals, distribution and forms of NM were studied in base metal sulphides by laser ablation-inductively coupled plasma mass spectrometry and by neutron activation analysis. Composition of arsenopyrite and As-pyrite, proper Au and Ag minerals were identified using electron probe microanalysis. The ratio of various forms of invisible gold—which includes nanoparticles and chemically bound gold—in sulphides is discussed. Observations were also performed on about 120 synthetic crystals of NM-doped sphalerite and greenockite. In VMS ores with increasing metamorphism, CAu and CAg in the major sulphides (sphalerite, chalcopyrite, pyrite) generally decrease. A portion of invisible gold also decreases —from ~65–85% to ~35–60% of the total Au. As a result of recrystallisation of ores, the invisible gold is enlarged and passes into the visible state as native gold, Au-Ag tellurides and sulphides. In the gold deposits of the Urals, the portion of invisible gold is usually <30% of the bulk Au.

ACS Style

Ilya Vikentyev; Olga Vikent’Eva; Eugenia Tyukova; Maximilian Nikolsky; Julia Ivanova; Nina Sidorova; Dmitry Tonkacheev; Vera Abramova; Vyacheslav Blokov; Adelina Spirina; Diana Borisova; Galina Palyanova. Noble Metal Speciations in Hydrothermal Sulphides. Minerals 2021, 11, 488 .

AMA Style

Ilya Vikentyev, Olga Vikent’Eva, Eugenia Tyukova, Maximilian Nikolsky, Julia Ivanova, Nina Sidorova, Dmitry Tonkacheev, Vera Abramova, Vyacheslav Blokov, Adelina Spirina, Diana Borisova, Galina Palyanova. Noble Metal Speciations in Hydrothermal Sulphides. Minerals. 2021; 11 (5):488.

Chicago/Turabian Style

Ilya Vikentyev; Olga Vikent’Eva; Eugenia Tyukova; Maximilian Nikolsky; Julia Ivanova; Nina Sidorova; Dmitry Tonkacheev; Vera Abramova; Vyacheslav Blokov; Adelina Spirina; Diana Borisova; Galina Palyanova. 2021. "Noble Metal Speciations in Hydrothermal Sulphides." Minerals 11, no. 5: 488.

Journal article
Published: 15 January 2021 in Minerals
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The binary synthetic compounds of Pt with chalcogens (O, S, Se, Te), pnictogens (As, Sb, Bi), and intermetallic compounds with Ga, In, and Sn of various stoichiometry were studied via X-ray absorption spectroscopy (XAS). The partial atomic charges of Pt in the compounds were computed using quantum chemical density functional theory (DFT) based methods: the Bader (QTAIM) method, and the density-derived electrostatic and chemical (DDEC6) approach. Strong positive correlations were established between the calculated partial atomic charges of Pt and the electronegativity (χ) of ligands. The partial charge of Pt in PtL2 compounds increases much sharply when the ligand electronegativity increases than the Pt partial charge in PtL compounds. The effect of the ligand-to-Pt atomic ratio on the calculated Pt partial charge depended on ligand electronegativity. The DDEC6 charge of Pt increases sharply with the growth of the number of ligands in PtSn (n = 1, 2; electronegativity χ(S) >> χ(Pt)), weakly depends on the phase composition in PtTen (n = 1, 2; χ(Te) is slightly lower than χ(Pt)), and decreases (becomes more negative) with increase of the ligand-to-Pt ratio in intermetallic compounds with electron donors (χ(L) < χ(Pt), L = Ga, In, Sn). According to XANES spectroscopy, the number of 5d (L2,3 absorption edges) and 6p (L1-edge) electrons at the Pt site decreased when ligand electronegativity increased in chalcogenides and pnictides groups. An increase of the ligand-to-Pt ratio resulted in the increase of the Pt L3-edge white line intensity and area in all studied compounds. In the case of chalcogenides and pnictides, this behavior was consistent with the electronegativity rule as it indicated a loss of Pt 5d electrons caused by the increase of the number of ligands, i.e., acceptors of electrons. However, in the case of ligands–electron donors (Te, Sn, Ga, In) this observation is in apparent contradiction with the electronegativity arguments as it indicates the increase of the number of Pt 5d-shell vacancies (holes) with the increase of the number of the ligands, for which the opposite trend is expected. This behavior can be explained in the framework of the charge compensation model. The loss of the Pt d-electrons in compounds with low ligand electronegativity (χ(Pt) > χ(L)) was overcompensated by the gain of the hybridized s-p electron density, which was confirmed by Pt L1 - edge spectra analysis. As a result, the total electron density at the Pt site followed the electronegativity rule, i.e., it increased with the growth of the number of the ligands-electron donors. The empirical correlations between the Pt partial atomic charges and parameters of XANES spectral features were used to identify the state of Pt in pyrite, and can be applied to determine the state of Pt in other ore minerals.

ACS Style

Polina V. Evstigneeva; Alexander L. Trigub; Dmitriy A. Chareev; Max S. Nickolsky; Boris R. Tagirov. The Charge State of Pt in Binary Compounds and Synthetic Minerals Determined by X-ray Absorption Spectroscopy and Quantum Chemical Calculations. Minerals 2021, 11, 79 .

AMA Style

Polina V. Evstigneeva, Alexander L. Trigub, Dmitriy A. Chareev, Max S. Nickolsky, Boris R. Tagirov. The Charge State of Pt in Binary Compounds and Synthetic Minerals Determined by X-ray Absorption Spectroscopy and Quantum Chemical Calculations. Minerals. 2021; 11 (1):79.

Chicago/Turabian Style

Polina V. Evstigneeva; Alexander L. Trigub; Dmitriy A. Chareev; Max S. Nickolsky; Boris R. Tagirov. 2021. "The Charge State of Pt in Binary Compounds and Synthetic Minerals Determined by X-ray Absorption Spectroscopy and Quantum Chemical Calculations." Minerals 11, no. 1: 79.

Journal article
Published: 24 September 2020 in Minerals
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The distortion of atomic structure around In and Cu dopants in sphalerite ZnS was explored by extended X-ray absorption fine structure (EXAFS) spectroscopy enhanced by reverse Monte Carlo (RMC) simulation (RMC-EXAFS method). These data were complemented with quantum chemical Density Functional Theory (DFT) calculations and theoretical modeling of X-ray absorption near edge spectroscopy (XANES) spectra. The RMC-EXAFS method showed that in the absence of Cu, the In-bearing solid solution is formed via the charge compensation scheme 3Zn2+↔2In3+ + □, where □ is a Zn vacancy. The coordination spheres of In remain undistorted. Formation of the solid solution in the case of (In, Cu)-bearing sphalerites follows the charge compensation scheme 2Zn2+↔Cu+ + In3+. In the solid solution, splitting of the interatomic distances in the 2nd and 3rd coordination spheres of In and Cu is observed. The dopants’ local atomic structure is slightly distorted around In but highly distorted around Cu. The DFT calculations showed that the geometries with close arrangement (clustering) of the impurities—In and Cu atoms, or the In atom and a vacancy—are energetically more favorable than the random distribution of the defects. However, as no heavy In atoms were detected in the 2nd shell of Cu by means of EXAFS, and the 2nd shell of In was only slightly distorted, we conclude that the defects are distributed randomly (or at least, not close to each other). The disagreement of the RMC-EXAFS fittings with the results of the DFT calculations, according to which the closest arrangement of dopants is the most stable configuration, can be explained by the presence of other defects of the sphalerite crystal lattice, which were not considered in the DFT calculations.

ACS Style

Alexander L. Trigub; Nikolay D. Trofimov; Boris R. Tagirov; Max S. Nickolsky; Kristina O. Kvashnina. Probing the Local Atomic Structure of In and Cu in Sphalerite by XAS Spectroscopy Enhanced by Reverse Monte Carlo Algorithm. Minerals 2020, 10, 841 .

AMA Style

Alexander L. Trigub, Nikolay D. Trofimov, Boris R. Tagirov, Max S. Nickolsky, Kristina O. Kvashnina. Probing the Local Atomic Structure of In and Cu in Sphalerite by XAS Spectroscopy Enhanced by Reverse Monte Carlo Algorithm. Minerals. 2020; 10 (10):841.

Chicago/Turabian Style

Alexander L. Trigub; Nikolay D. Trofimov; Boris R. Tagirov; Max S. Nickolsky; Kristina O. Kvashnina. 2020. "Probing the Local Atomic Structure of In and Cu in Sphalerite by XAS Spectroscopy Enhanced by Reverse Monte Carlo Algorithm." Minerals 10, no. 10: 841.

Original paper
Published: 29 July 2020 in Mineralogy and Petrology
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Results of a spectroscopic and microstructural investigation of mineral grains extracted from lava-like fuel-containing materials – Chernobyl “lava” – are presented. Raman, photoluminescence and infrared spectra reveal the presence of abundant U4+, traces of Sm3+ and Cr3+ in grains of U-containing zircon and ZrO2. No oxidation of UO2 particles is observed. The ZrO2 grains consist predominantly of the monoclinic polymorph and are often twinned. Raman spectra indicate the presence of the tetragonal polymorph, which is likely stabilized by the presence of U. It is suggested that spontaneous transformation of partially stabilized tetragonal (Zr,U)O2 to the monoclinic phase, and a corresponding volume expansion, are important factors affecting the rate of mechanical degradation of the “lava”. Transmission electron microscopy of U-rich zircon suggests the absence of precipitation of any independent U-containing phases, implying that U is fully incorporated within the zircon lattice as an impurity. Grains of rutile, corundum, quartz and natural zircon originating from construction materials of the reactor are described. Results obtained here are important for the validation of computer codes describing severe nuclear accidents.

ACS Style

Andrey A. Shiryaev; Boris E. Burakov; Irina E. Vlasova; Max Nickolsky; Alexei A. Averin; Alexei V. Pakhnevich. Study of mineral grains extracted from the Chernobyl “lava”. Mineralogy and Petrology 2020, 114, 489 -499.

AMA Style

Andrey A. Shiryaev, Boris E. Burakov, Irina E. Vlasova, Max Nickolsky, Alexei A. Averin, Alexei V. Pakhnevich. Study of mineral grains extracted from the Chernobyl “lava”. Mineralogy and Petrology. 2020; 114 (6):489-499.

Chicago/Turabian Style

Andrey A. Shiryaev; Boris E. Burakov; Irina E. Vlasova; Max Nickolsky; Alexei A. Averin; Alexei V. Pakhnevich. 2020. "Study of mineral grains extracted from the Chernobyl “lava”." Mineralogy and Petrology 114, no. 6: 489-499.

Journal article
Published: 20 July 2020 in Minerals
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The oxidation state and local atomic environment of admixtures of In, Cu, and Ag in synthetic sphalerite crystals were determined by X-ray absorption spectroscopy (XAS). The sphalerite crystals doped with In, Cu, Ag, In–Cu, and In–Ag were synthesized utilizing gas transport, salt flux, and dry synthesis techniques. Oxidation states of dopants were determined using X-ray absorption near edge structure (XANES) technique. The local atomic structure was studied by X-ray absorption fine structure spectroscopy (EXAFS). The spectra were recorded at Zn, In, Ag, and Cu K-edges. In all studied samples, In was in the 3+ oxidation state and replaced Zn in the structure of sphalerite, which occurs with the expansion of the nearest coordination shells due to the large In ionic radius. In the presence of In, the oxidation state of Cu and Ag is 1+, and both metals can form an isomorphous solid solution where they substitute for Zn according to the coupled substitution scheme 2Zn2+ ↔ Me+ + In3+. Moreover, Ag K-edges EXAFS spectra fitting, combined with the results obtained for In- and Au-bearing sphalerite shows that the Me-S distances in the first coordination shell in the solid solution state are correlated with the ionic radii and increase in the order of Cu < Ag < Au. The distortion of the atomic structure increases in the same order. The distant (second and third) coordination shells of Cu and Ag in sphalerite are split into two subshells, and the splitting is more pronounced for Ag. Analysis of the EXAFS spectra, coupled with the results of DFT (Density Function Theory) simulations, showed that the In–In and Me+–In3+ clustering is absent when the metals are present in the sphalerite solid solution. Therefore, all studied admixtures (In, Cu, Ag), as well as Au, are randomly distributed in the matrix of sphalerite, where the concentration of the elements in the “invisible” form can reach a few tens wt.%.

ACS Style

Nikolay D. Trofimov; Alexander L. Trigub; Boris R. Tagirov; Olga N. Filimonova; Polina V. Evstigneeva; Dmitriy A. Chareev; Kristina O. Kvashnina; Maximilian S. Nickolsky. The State of Trace Elements (In, Cu, Ag) in Sphalerite Studied by X-Ray Absorption Spectroscopy of Synthetic Minerals. Minerals 2020, 10, 640 .

AMA Style

Nikolay D. Trofimov, Alexander L. Trigub, Boris R. Tagirov, Olga N. Filimonova, Polina V. Evstigneeva, Dmitriy A. Chareev, Kristina O. Kvashnina, Maximilian S. Nickolsky. The State of Trace Elements (In, Cu, Ag) in Sphalerite Studied by X-Ray Absorption Spectroscopy of Synthetic Minerals. Minerals. 2020; 10 (7):640.

Chicago/Turabian Style

Nikolay D. Trofimov; Alexander L. Trigub; Boris R. Tagirov; Olga N. Filimonova; Polina V. Evstigneeva; Dmitriy A. Chareev; Kristina O. Kvashnina; Maximilian S. Nickolsky. 2020. "The State of Trace Elements (In, Cu, Ag) in Sphalerite Studied by X-Ray Absorption Spectroscopy of Synthetic Minerals." Minerals 10, no. 7: 640.

Journal article
Published: 19 May 2020 in Sustainability
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Structural properties and water dissolution of six sodium–aluminum–phosphate (NAP) glasses have been investigated before and after irradiation by a gamma-ray source based on 60Co. Two of these samples were of simple composition, and four samples had a complex composition with radionuclide simulants representing actinides, fission, and activated corrosion products. Samples of the simple composition are fully vitreous, whereas samples of the complex composition contained up to 10 vol.% of aluminum–phosphate, AlPO4, and traces of ruthenium dioxide, RuO2. Based on the study of pristine and irradiated glasses, it was established that the radiation dose of 62 million Gray had practically no effect on the phase composition and structure of samples. At the same time, the rate of leaching of elements from the irradiated samples by water was decreased by about two times.

ACS Style

Alexey V. Luzhetsky; Vladislav A. Petrov; Sergey V. Yudintsev; Viktor I. Malkovsky; Michael I. Ojovan; Maximilian S. Nickolsky; Andrey A. Shiryaev; Sergey S. Danilov; Elizaveta E. Ostashkina. Effect of Gamma Irradiation on Structural Features and Dissolution of Nuclear Waste Na–Al–P Glasses in Water. Sustainability 2020, 12, 4137 .

AMA Style

Alexey V. Luzhetsky, Vladislav A. Petrov, Sergey V. Yudintsev, Viktor I. Malkovsky, Michael I. Ojovan, Maximilian S. Nickolsky, Andrey A. Shiryaev, Sergey S. Danilov, Elizaveta E. Ostashkina. Effect of Gamma Irradiation on Structural Features and Dissolution of Nuclear Waste Na–Al–P Glasses in Water. Sustainability. 2020; 12 (10):4137.

Chicago/Turabian Style

Alexey V. Luzhetsky; Vladislav A. Petrov; Sergey V. Yudintsev; Viktor I. Malkovsky; Michael I. Ojovan; Maximilian S. Nickolsky; Andrey A. Shiryaev; Sergey S. Danilov; Elizaveta E. Ostashkina. 2020. "Effect of Gamma Irradiation on Structural Features and Dissolution of Nuclear Waste Na–Al–P Glasses in Water." Sustainability 12, no. 10: 4137.

Full paper
Published: 30 April 2020 in European Journal of Inorganic Chemistry
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ACS Style

Sergey S. Shapovalov; Ivan V. Skabitsky; Natalia A. Mayorova; Andrey A. Shiryaev; Maximillian S. Nickolsky; Vitali A. Grinberg. Synthesis of Cobalt-Iron Chalcogenide Clusters as Precursors for Catalysts of Oxygen Electroreduction in Alkali Media. European Journal of Inorganic Chemistry 2020, 2020, 2055 -2062.

AMA Style

Sergey S. Shapovalov, Ivan V. Skabitsky, Natalia A. Mayorova, Andrey A. Shiryaev, Maximillian S. Nickolsky, Vitali A. Grinberg. Synthesis of Cobalt-Iron Chalcogenide Clusters as Precursors for Catalysts of Oxygen Electroreduction in Alkali Media. European Journal of Inorganic Chemistry. 2020; 2020 (21):2055-2062.

Chicago/Turabian Style

Sergey S. Shapovalov; Ivan V. Skabitsky; Natalia A. Mayorova; Andrey A. Shiryaev; Maximillian S. Nickolsky; Vitali A. Grinberg. 2020. "Synthesis of Cobalt-Iron Chalcogenide Clusters as Precursors for Catalysts of Oxygen Electroreduction in Alkali Media." European Journal of Inorganic Chemistry 2020, no. 21: 2055-2062.

Journal article
Published: 17 March 2020 in Ore Geology Reviews
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In many hydrothermal deposits arsenian pyrite contains economic concentrations of Au in an “invisible” form, which is structurally bound in pyrite or has grain size <0.1 μm. Here we use X-ray absorption spectroscopy (XAS) of natural minerals and synthetic phases to reveal the forms of Au occurrence in pyrite and determine the effect of physicochemical-compositional parameters on the concentration and state of “invisible” Au. A sample of natural arsenian pyrite with 300 ppm Au and 0.34 wt% As (average value) from the Samolazovskoe Au-sulfide deposit (Yakutia, Russia) was used to study the states of Au and As, and two arsenian pyrite samples from the Vorontsovka Carlin-type deposit (North Urals, Russia) were used to characterize the state of As. The synthesis experiments were performed employing the hydrothermal method at 300 °C/Psat and 450 °C/1000 bar, at contrasting redox states – in oxidized (H2S/H2SO4 redox buffer) and reduced (H2S predominates) fluids, in As-free and As-bearing systems. As a result, a series of samples of As-free and arsenian pyrites was obtained with Au concentrations from ca. 100 to 300 ppm. The concentration of “invisible” Au, which was homogeneously distributed within the samples, was independent of As concentration but decreased with increasing synthesis temperature. The concentration of Au dissolved in acidic sulfide hydrothermal fluid was not affected by the presence of As. The X-ray absorption XANES/EXAFS spectra were recorded simultaneously at Au L3-edge and As K-edge. The use of the high energy resolution fluorescence detection (HERFD-XAS) mode made possible to acquire data for the trace amounts of Au in As-rich samples. According to XANES spectroscopy Au occurs in pyrite in the 1 + oxidation state. Two forms of Au were detected in the pyrite samples: the solid solution Au and Au2S-like clusters/inclusions. In the solid solution state Au replaces Fe in the structure of pyrite and is coordinated only with sulfur atoms (NS = 6, RAu-S = 2.41 ± 0.01 Å) in all pyrite samples independently of the conditions of their formation/synthesis and As content, no As atoms were detected in the local atomic environment of Au. Thus, the Au-S distance in the 1st coordination shell increased by 0.15 Å relatively to the Fe-S distance in pure pyrite. The distant coordination shells of the solid solution Au correspond to the pyrite crystal structure. The presence of the Au2S-like clusters leads to a significant decrease of the calculated values of coordination number of Au and Au-S interatomic distance. In natural pyrite samples from the Vorontsovka deposit As1− replaces S in the anionic sites, increasing the 1st shell As-S and As-Fe distances by 0.07–0.1 Å relatively to the pure pyrite structure. A contribution of As3+ oxide was detected in pyrite from the Vorontsovka deposit. The synthetic pyrite samples contain As in the form of As1− solid solution and As3+ and As5+ oxides. Results of our study show that neither the concentration and speciation of As nor the redox state of the system affect the state of “invisible” Au in the studied pyrites.

ACS Style

Olga N. Filimonova; Boris R. Tagirov; Alexander L. Trigub; Maximilian S. Nickolsky; Mauro Rovezzi; Elena V. Belogub; Vladimir L. Reukov; Ilya V. Vikentyev. The state of Au and As in pyrite studied by X-ray absorption spectroscopy of natural minerals and synthetic phases. Ore Geology Reviews 2020, 121, 103475 .

AMA Style

Olga N. Filimonova, Boris R. Tagirov, Alexander L. Trigub, Maximilian S. Nickolsky, Mauro Rovezzi, Elena V. Belogub, Vladimir L. Reukov, Ilya V. Vikentyev. The state of Au and As in pyrite studied by X-ray absorption spectroscopy of natural minerals and synthetic phases. Ore Geology Reviews. 2020; 121 ():103475.

Chicago/Turabian Style

Olga N. Filimonova; Boris R. Tagirov; Alexander L. Trigub; Maximilian S. Nickolsky; Mauro Rovezzi; Elena V. Belogub; Vladimir L. Reukov; Ilya V. Vikentyev. 2020. "The state of Au and As in pyrite studied by X-ray absorption spectroscopy of natural minerals and synthetic phases." Ore Geology Reviews 121, no. : 103475.

Journal article
Published: 12 December 2019 in Journal of Nuclear Materials
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Murataite-based ceramics containing 10 wt% rare earth (REs = La, Ce, Nd, Ho) or actinide (An = Th, U) oxides were produced in a resistive furnace at a temperature of 1500 °C. The samples were composed of major murataite-type phases and minor perovskite, crichtonite, and zirconolite/pyrochlore. Light (Ce-group) REs are concentrated in the perovskite whereas Nd and Ho are mainly accommodated in the murataite. U and Th enter predominantly murataite. Ce and U regardless from their oxidation state in the batch (Ce2O3/CeO2, UO2/UO3) exist in the murataite as Ce(III) or U(IV) with some contribution due to U(V) for the uranium-doped sample.

ACS Style

S.V. Stefanovsky; S.V. Yudintsev; Max Nickolsky; O.I. Stefanovsky; M.V. Skvortsov. Characterization of modified murataite based ceramics as a perspective hosts for actinides, fission, and corrosion products of HLW. Journal of Nuclear Materials 2019, 529, 151958 .

AMA Style

S.V. Stefanovsky, S.V. Yudintsev, Max Nickolsky, O.I. Stefanovsky, M.V. Skvortsov. Characterization of modified murataite based ceramics as a perspective hosts for actinides, fission, and corrosion products of HLW. Journal of Nuclear Materials. 2019; 529 ():151958.

Chicago/Turabian Style

S.V. Stefanovsky; S.V. Yudintsev; Max Nickolsky; O.I. Stefanovsky; M.V. Skvortsov. 2019. "Characterization of modified murataite based ceramics as a perspective hosts for actinides, fission, and corrosion products of HLW." Journal of Nuclear Materials 529, no. : 151958.

Journal article
Published: 01 December 2019 in Economic Geology
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Pyrite (FeS2) is a typical container of Pt in ores of magmatic and hydrothermal origin and in some carbonrich ores of sedimentary-diagenetic origin. Knowledge of the state of Pt disseminated in the matrix of pyrite, including local atomic environment (type of atoms in the nearest and distant coordination shells, coordination numbers, interatomic distances) and oxidation state, is necessary for physical-chemical modeling of platinum group element mineralization and for the improvement of Pt ore extraction and processing technologies. Here we report results of an investigation of local atomic structure of synthetic Pt-bearing pyrites by means of X-ray absorption spectroscopy (XAS). Synthesis experiments, performed at 580° and 590°C in a Pt-saturated system by means of salt-flux method, yielded crystals of pyrite with concentrations of Pt up to 4 wt %. Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) showed that the distribution of Pt within the pyrite grains is of zonal character, but within the distinct zones Pt is distributed homogeneously. Negative correlation between the concentrations of Pt and Fe was observed in the synthesized pyrite grains. The slope of the correlation line corresponds to the formation of the solid solution in the Pt-Fe-S system and/or to the formation of PtS2. The XAS experiments revealed the existence of two forms of Pt in pyrite. The main form is the solid solution Pt(IV), which isomorphically substitutes for Fe. The Pt-S distance in pyrite is ~0.1 Å longer than that of Fe-S in pure pyrite. The distortion of the pyrite crystal structure disappears at R >2.5 Å. The second Pt-rich form was identified by means of high-resolution transmission electron microscopy (HRTEM) as nanosized inclusions of PtS2. Heating experiments with in situ registration of X-ray absorption spectra resulted in partial decomposition (dissolution) of PtS2 nanosized inclusions with the formation of the solid solution (Fe1–xPtx)S2. Therefore, the PtS2 nanosized particles can be considered as a quench product. Our data demonstrate that both Pt solid solution and PtS2 nanosized inclusions (at high Pt content) can exist in natural Pt-bearing pyrites.

ACS Style

Olga N. Filimonova; Max Nickolsky; Alexander L. Trigub; Dmitriy A. Chareev; Kristina O. Kvashnina; Elena V. Kovalchuk; Ilya Vikentyev; Boris R. Tagirov. The State of Platinum in Pyrite Studied by X-Ray Absorption Spectroscopy of Synthetic Crystals. Economic Geology 2019, 114, 1649 -1663.

AMA Style

Olga N. Filimonova, Max Nickolsky, Alexander L. Trigub, Dmitriy A. Chareev, Kristina O. Kvashnina, Elena V. Kovalchuk, Ilya Vikentyev, Boris R. Tagirov. The State of Platinum in Pyrite Studied by X-Ray Absorption Spectroscopy of Synthetic Crystals. Economic Geology. 2019; 114 (8):1649-1663.

Chicago/Turabian Style

Olga N. Filimonova; Max Nickolsky; Alexander L. Trigub; Dmitriy A. Chareev; Kristina O. Kvashnina; Elena V. Kovalchuk; Ilya Vikentyev; Boris R. Tagirov. 2019. "The State of Platinum in Pyrite Studied by X-Ray Absorption Spectroscopy of Synthetic Crystals." Economic Geology 114, no. 8: 1649-1663.

Journal article
Published: 19 September 2019 in Radiochimica Acta
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Several 238Pu-doped Eu monazite single crystals stored at ambient conditions are monitored for 15 years using Scanning and Transmission electron microscopy, spectroscopy, diffraction and optical microscopy. Despite preservation of high crystalline quality, mechanical cracking and formation of small flakes is observed. After several month of aging, a new phase appeared on surfaces of the crystals, which later formed a continuous shell of most crystallographic faces. Electron diffraction indicated that the shell consists of submicron Pu-containing rhabdophanes. Its formation likely occurs due to combined action of atmospheric moisture and recrystallisation of radiation damage in monazite domains adjacent to external and internal surfaces. Extent of the rhabdophane formation appears to be influenced by crystallography and Pu content of corresponding growth sectors of the parent monazite. Whereas macroscopic rhabdophanes and monazites are relatively stable against irradiation, formation of sub-microscopic particles is a point of concern for development of monazite-based ceramic forms for actinide immobilization.

ACS Style

Andrey A. Shiryaev; Boris E. Burakov; Maximillian S. Nickolsky; Vasily O. Yapaskurt; Anton D. Pavlushin; Mikhail S. Grigoriev; Irina E. Vlasova. Surface features on aged 238Pu-doped Eu-monazite. Radiochimica Acta 2019, 108, 353 -360.

AMA Style

Andrey A. Shiryaev, Boris E. Burakov, Maximillian S. Nickolsky, Vasily O. Yapaskurt, Anton D. Pavlushin, Mikhail S. Grigoriev, Irina E. Vlasova. Surface features on aged 238Pu-doped Eu-monazite. Radiochimica Acta. 2019; 108 (5):353-360.

Chicago/Turabian Style

Andrey A. Shiryaev; Boris E. Burakov; Maximillian S. Nickolsky; Vasily O. Yapaskurt; Anton D. Pavlushin; Mikhail S. Grigoriev; Irina E. Vlasova. 2019. "Surface features on aged 238Pu-doped Eu-monazite." Radiochimica Acta 108, no. 5: 353-360.

Conference paper
Published: 07 June 2019 in E3S Web of Conferences
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Arsenian pyrite is an abundant mineral occurring in many geological settings at the Earth’s surface, including hydrothermal ore deposits which are the main source of Au. So-called “invisible” (or refractory) form of Au is present in pyrites in all types of these deposits, and its concentration is often directly correlated with As content. Here we report results of the investigation of the local atomic structure of Au in natural (Cu-Au-porphyry) and synthetic (450°C/ 1 kbar, 300°C/ Psat) As-free and As-bearing pyrites by means of X-ray absorption spectroscopy (XAS). In addition, the state of As was determined in pyrite samples from Carlin-type deposit. XANES/EXAFS measurements, compiled with previously published data, revealed the chemical state (valence state, local atomic environment) of Au and As in arsenian pyrites. Au is present in the solid solution state (Au1+ in the Fe position, octahedrally coordinated by S atoms), as well as in Au1+2S clusters (Au1+ linearly coordinated by 2 S atoms). The admixture of As has no effect on the Au valence state and Au-S interatomic distance, except one synthetic sample containing a minor amount of FeAsS. Arsenic mostly incorporates into the anion site in pyrite lattice (S1-↔As1-). Our data demonstrate that pyrites of hydrothermal origin can host up to ~300 ppm of structurally bound “invisible” Au independently of As content.

ACS Style

Olga Filimonova; Alexander Trigub; Max Nickolsky; Elena Kovalchuk; Vera Abramova; Mauro Rovezzi; Elena Belogub; Ilya Vikentyev; Boris Tagirov. X-ray absorption spectroscopy study of the chemistry of «invisible» Au in arsenian pyrites. E3S Web of Conferences 2019, 98, 05007 .

AMA Style

Olga Filimonova, Alexander Trigub, Max Nickolsky, Elena Kovalchuk, Vera Abramova, Mauro Rovezzi, Elena Belogub, Ilya Vikentyev, Boris Tagirov. X-ray absorption spectroscopy study of the chemistry of «invisible» Au in arsenian pyrites. E3S Web of Conferences. 2019; 98 ():05007.

Chicago/Turabian Style

Olga Filimonova; Alexander Trigub; Max Nickolsky; Elena Kovalchuk; Vera Abramova; Mauro Rovezzi; Elena Belogub; Ilya Vikentyev; Boris Tagirov. 2019. "X-ray absorption spectroscopy study of the chemistry of «invisible» Au in arsenian pyrites." E3S Web of Conferences 98, no. : 05007.

Journal article
Published: 01 April 2019 in Journal of Nuclear Materials
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ACS Style

S.V. Yudintsev; S.V. Stefanovsky; B.S. Nikonov; O.I. Stefanovsky; Max Nickolsky; M.V. Skvortsov; A.V. Mokhov. Phase formation at synthesis of murataite-crichtonite ceramics. Journal of Nuclear Materials 2019, 517, 371 -379.

AMA Style

S.V. Yudintsev, S.V. Stefanovsky, B.S. Nikonov, O.I. Stefanovsky, Max Nickolsky, M.V. Skvortsov, A.V. Mokhov. Phase formation at synthesis of murataite-crichtonite ceramics. Journal of Nuclear Materials. 2019; 517 ():371-379.

Chicago/Turabian Style

S.V. Yudintsev; S.V. Stefanovsky; B.S. Nikonov; O.I. Stefanovsky; Max Nickolsky; M.V. Skvortsov; A.V. Mokhov. 2019. "Phase formation at synthesis of murataite-crichtonite ceramics." Journal of Nuclear Materials 517, no. : 371-379.

Journal article
Published: 28 March 2019 in Geochimica et Cosmochimica Acta
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Hydrothermal chloride-rich fluids are identified at the late stages of the formation of platinum group element (PGE) deposits in giant layered intrusions, and are considered as the PGEs transport media in Cu(-Mo,Au) porphyry systems. In order to quantify the hydrothermal mobility of Pt we performed an investigation of the speciation of Pt in hydrothermal chloride-bearing fluids and dry melt by means of X-ray absorption spectroscopy (XAS). The experiments consisted in recording the Pt L3-edge X-ray absorption near edge structure/extended X-ray absorption fine structure (XANES/EXAFS) spectra of Pt-bearing fluids obtained by dissolution of Pt metal in KCl/HCl and CsCl/HCl fluids in the temperature range from 450 to 575 °C at pressures from 0.5 to 5 kbar. A spectrum of Pt dissolved in dry CsCl/NaCl/KCl + K2S2O8 melt was recorded at 650 °C. The capillary method, when the experimental solution together with Pt(cr) is sealed inside a silica glass capillary, was used. As was determined from the XANES spectra, in all the experimental systems Pt existed in the +2 oxidation state. Analysis of EXAFS spectra showed that Pt is coordinated by four Cl atoms with RPt-Cl = 2.31±0.01 Å independently of the T-P-compositional parameters. No evidence of the formation of complex with alkali metal cations in the second coordination sphere of Pt was found by the analysis of the EXAFS spectra of concentrated CsCl brines and melt. Our results imply that PtCl42- is the main Pt-Cl complex which predominates in hydrothermal fluids at t > 400 °C and fluid density d > 0.3 g⋅cm-3. Experimental data obtained for dry melt of alkali metal chlorides suggest that Pt-Cl complexes can dominate Pt speciation in chloride-bearing aluminosilicate melts where Cl exhibits a salt-like atomic arrangement and ionic bonding. The literature data on the Pt solubility constant, Pt(cr)+2HCl(aq)o+2Cl-=PtCl42-+H2(aq), are compiled and fitted to the simple density model equation logKso(PtCl42-)=0.973-8202T(K)-1-5.505logdw+2223logd(w)T(K)-1, where d(w) is the pure water density in g⋅cm-3. The equation, combined with the extended Debye-Hückel equation for activity coefficients, can be used to calculate the solubility of Pt up to 1000 °C/5 kbar. It accurately predicts the solubility of Pt in concentrated chloride brine (up to 50 wt% NaCl) at parameters of magmatic-hydrothermal transition (800 °C/1.4 kbar). At fluid/vapor density below 0.3 g⋅cm-3 a neutral complex PtCl2°(aq) is suggested as the dominant Pt species. Our data demonstrate that Pt is highly mobile in high-temperature oxidized chloride-rich hydrothermal fluids. For example, at 800 °C/2 kbar the concentration of Pt can reach a few wt.% in the 1 wt% HCl/50 wt% NaCl fluid which is in equilibrium with magnetite-hematite buffer. Once a Cl-reach fluid exsolves from alumuinosilicate melt, Pt follows Cl and enriches the fluid phase where it exists mostly in the form of PtCl42-. Decrease of temperature, acidity, and fluid chlorinity results in precipitation of Pt from the fluid phase.

ACS Style

Boris R. Tagirov; Olga N. Filimonova; Alexander L. Trigub; Nikolay N. Akinfiev; Maximilian S. Nickolsky; Kristina O. Kvashnina; Dmitriy A. Chareev; Alexander V. Zotov. Platinum transport in chloride-bearing fluids and melts: Insights from in situ X-ray absorption spectroscopy and thermodynamic modeling. Geochimica et Cosmochimica Acta 2019, 254, 86 -101.

AMA Style

Boris R. Tagirov, Olga N. Filimonova, Alexander L. Trigub, Nikolay N. Akinfiev, Maximilian S. Nickolsky, Kristina O. Kvashnina, Dmitriy A. Chareev, Alexander V. Zotov. Platinum transport in chloride-bearing fluids and melts: Insights from in situ X-ray absorption spectroscopy and thermodynamic modeling. Geochimica et Cosmochimica Acta. 2019; 254 ():86-101.

Chicago/Turabian Style

Boris R. Tagirov; Olga N. Filimonova; Alexander L. Trigub; Nikolay N. Akinfiev; Maximilian S. Nickolsky; Kristina O. Kvashnina; Dmitriy A. Chareev; Alexander V. Zotov. 2019. "Platinum transport in chloride-bearing fluids and melts: Insights from in situ X-ray absorption spectroscopy and thermodynamic modeling." Geochimica et Cosmochimica Acta 254, no. : 86-101.

Journal article
Published: 04 March 2019 in Mineralogical Magazine
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Sphalerite is the main source of In – a ‘critical’ metal widely used in high-tech electronics. In this mineral the concentration of In is commonly correlated directly with Cu content. Here we use X-ray absorption spectroscopy of synthetic compounds and natural crystals in order to investigate the substitution mechanisms in sphalerites where In is present, together with the group 11 metals. All the admixtures (Au, Cu, In) are distributed homogeneously within the sphalerite matrix, but their structural and chemical states are different. In all the samples investigated In3+ replaces Zn in the structure of sphalerite. The In ligand distance increases by 0.12 Å and 0.09–0.10 Å for the 1st and 2nd coordination shells, respectively, in comparison with pure sphalerite. The In–S distance in the 3rd coordination shell is close to the one of pure sphalerite. Gold in synthetic sphalerites is coordinated with sulfur (NS = 2.4–2.5, RAu–S = 2.35 ± 0.01 Å). Our data suggest that at high Au concentrations (0.03–0.5 wt.%) the Au2S clusters predominate, with a small admixture of the Au+ solid solution with an Au–S distance of 2.5 Å. Therefore, the homogeneous character of a trace-element distribution, which is commonly observed in natural sulfides, does not confirm formation of a solid solution. In contrast to Au, the presence of Cu+ with In exists only in the solid-solution state, where it is tetrahedrally coordinated with S atoms at a distance of 2.30 ± 0.03 Å. The distant coordination shells of Cu are disordered. These results demonstrate that the group 11 metals (Cu, Ag and Au) can exist in sphalerite in the metastable solid-solution state. The solid solution forms at high temperature via the charge compensation scheme 2Zn2+↔Me++Me3+. The final state of the trace elements at ambient temperature is governed by the difference in ionic radii with the main component (Zn), and concentration of admixtures.

ACS Style

Olga Filimonova; Alexander Trigub; Dmitriy E. Tonkacheev; Max Nickolsky; Kristina O. Kvashnina; Dmitriy A. Chareev; Ilya Chaplygin; Elena V. Kovalchuk; Sara Lafuerza; Boris Tagirov. Substitution mechanisms in In-, Au-, and Cu-bearing sphalerites studied by X-ray absorption spectroscopy of synthetic compounds and natural minerals. Mineralogical Magazine 2019, 83, 435 -451.

AMA Style

Olga Filimonova, Alexander Trigub, Dmitriy E. Tonkacheev, Max Nickolsky, Kristina O. Kvashnina, Dmitriy A. Chareev, Ilya Chaplygin, Elena V. Kovalchuk, Sara Lafuerza, Boris Tagirov. Substitution mechanisms in In-, Au-, and Cu-bearing sphalerites studied by X-ray absorption spectroscopy of synthetic compounds and natural minerals. Mineralogical Magazine. 2019; 83 (3):435-451.

Chicago/Turabian Style

Olga Filimonova; Alexander Trigub; Dmitriy E. Tonkacheev; Max Nickolsky; Kristina O. Kvashnina; Dmitriy A. Chareev; Ilya Chaplygin; Elena V. Kovalchuk; Sara Lafuerza; Boris Tagirov. 2019. "Substitution mechanisms in In-, Au-, and Cu-bearing sphalerites studied by X-ray absorption spectroscopy of synthetic compounds and natural minerals." Mineralogical Magazine 83, no. 3: 435-451.

Research article
Published: 26 December 2018 in ACS Earth and Space Chemistry
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Chloride-bearing fluids are widespread in the Earth’s interior from low-temperature subsurface conditions to deep lithosphere. The concentration of chloride salts varies from diluted aqueous solutions to concentrated brines and anhydrous (dry) chloride melts beneath volcanoes. Here we report an investigation of the state of Au in hydrothermal chloride fluids and anhydrous melts by means of in situ X-ray absorption spectroscopy (XAS) combined with ab initio molecular dynamics (AIMD) simulations and thermodynamic modeling. The experiments included registration of Au L3-edge X-ray absorption near edge structure/extended X-ray absorption fine structure (XANES/EXAFS) spectra of Au-bearing fluids in the temperature range from 350 to 575 °C at pressures 150-4500 bar. Spectra of Au dissolved in dry CsCl/NaCl/KCl + K2S2O8 melt were recorded at 650 °C. It was found that Au is coordinated by two Cl atoms (R(Au-Cl) = 2.25 – 2.28 Å). The alkali metal atoms (Me) were detected in the distant coordination sphere of Au at R(Au-Me) = 3.3 – 4.1 Å. The alkali metal cations in the vicinity of Au-Cl complex partly compensate the positive charge located on Au and, by this way, affect the Au-Cl distance. An increase of the fluid pressure causes expansion of the 2nd coordination sphere composed of the alkali metal cations, which leads to the increase of the positive Au charge and results in slight contraction of the 1st coordination sphere of Au. Accordingly, the transport of Au in high-temperature chloride-bearing natural ore-forming fluids of moderate to high densities (> 0.3 g•cm-3), can be explicitly described by the formation of the AuCl2- at any salt concentration from low-salinity fluids to hydrosaline liquids and anhydrous melts. In general, this means that the hydrothermal fluid chemistry simplifies with increasing temperature.

ACS Style

Boris R. Tagirov; Alexander L. Trigub; Olga N. Filimonova; Kristina O. Kvashnina; Max Nickolsky; Sara Lafuerza; Dmitriy A. Chareev. Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics. ACS Earth and Space Chemistry 2018, 3, 240 -261.

AMA Style

Boris R. Tagirov, Alexander L. Trigub, Olga N. Filimonova, Kristina O. Kvashnina, Max Nickolsky, Sara Lafuerza, Dmitriy A. Chareev. Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics. ACS Earth and Space Chemistry. 2018; 3 (2):240-261.

Chicago/Turabian Style

Boris R. Tagirov; Alexander L. Trigub; Olga N. Filimonova; Kristina O. Kvashnina; Max Nickolsky; Sara Lafuerza; Dmitriy A. Chareev. 2018. "Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics." ACS Earth and Space Chemistry 3, no. 2: 240-261.

Original article
Published: 25 June 2018 in Meteoritics & Planetary Science
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Acid‐resistant residues (ARR) were separated from the Saratov (L4) meteorite with the aim to shed more light on the origin of the planetary noble gases (the Q‐gases) in meteorites and the nature of their carrier phase (Q‐phase). Eleven fractions were obtained by HCl and HCl+HF etching, ultrasonication, and subsequent density separation of the ARR in isopropanol and isopropanol+NaOH. Two aliquots of the fractions were also treated with H2O2 and HNO3 to investigate any influence of the oxidizing agent on the Q‐gases retention. The separated ARR fractions have been analyzed for C, N, and noble gases using step combustion. Raman and TEM analyses of the carbonaceous phase structures have also been applied for some of the fractions. This appears to be one of the most detailed investigations of the ARR fractions so far. The important observation made for the ARR fraction studied by TEM is the presence of abundant curved graphene stacks with a variable number of layers. Significant amounts of single‐ and bilayer graphenes and nanosized chromite grains partly covered with graphene layers are also observed. The principal features of the Q noble gases in the studied ARR fractions are the following. (1) Elemental composition of the Q‐gases depends on the extraction protocol. The most interesting is that upon H2O2 oxidation, the noble gases are retained in the sequence Xe

ACS Style

Anatolii V. Fisenko; Alexander B. Verchovsky; Andrei A. Shiryaev; Luba F. Semjonova; Alexey A. Averin; Alexander L. Vasiliev; Max Nickolsky. On the carrier phase of the “planetary” noble gases: TEM, Raman, and stepped combustion data for acid-resistant residues from the Saratov (L4) meteorite. Meteoritics & Planetary Science 2018, 53, 2343 -2356.

AMA Style

Anatolii V. Fisenko, Alexander B. Verchovsky, Andrei A. Shiryaev, Luba F. Semjonova, Alexey A. Averin, Alexander L. Vasiliev, Max Nickolsky. On the carrier phase of the “planetary” noble gases: TEM, Raman, and stepped combustion data for acid-resistant residues from the Saratov (L4) meteorite. Meteoritics & Planetary Science. 2018; 53 (11):2343-2356.

Chicago/Turabian Style

Anatolii V. Fisenko; Alexander B. Verchovsky; Andrei A. Shiryaev; Luba F. Semjonova; Alexey A. Averin; Alexander L. Vasiliev; Max Nickolsky. 2018. "On the carrier phase of the “planetary” noble gases: TEM, Raman, and stepped combustion data for acid-resistant residues from the Saratov (L4) meteorite." Meteoritics & Planetary Science 53, no. 11: 2343-2356.

Research article
Published: 18 April 2018 in Langmuir
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Porphyrin-based metal-organic networks on surfaces are a new class of planar materials with promising features for applications in chemical sensing, catalysis and organic optoelectronics at nanoscale. Herein we studied systematically a series of the SURMOFs assembled from variously meso-carboxyphenyl/pyridyl substituted porphyrins and zinc acetate on template monolayers of graphene oxide via layer-by-layer deposition. This microscopically flat template can initiate the growth of macroscopically uniform SURMOF films exhibiting well-resolved X-ray diffraction. By applying D’yakonov method, which has been previously used for the extraction of self-convolution of electron density in clay minerals, to the analysis of the experimental diffraction patterns of SURMOFs, we determined the relation between the structure of porphyrin linkers and the geometry of packing motives in the films. We showed that the packing of the SURMOFs differs significantly from that of bulk powders of similar composition because of steric limitations imposed on the assembly in 2D space. The results of microscopic examination of the SURMOFs suggest that the type of metal-to-linker chemical bonding dictates the morphology of the films. Our method provides an enlightening picture of the interplay between supramolecular ordering and surface-directed assembly in porphyrin-based SURMOFs and is useful for rationalizing the fabrication of various classes of layered metal-organic frameworks on solids.

ACS Style

Ivan Nikolaevich Meshkov; Alexandra Igorevna Zvyagina; Andrey A. Shiryaev; Maximilian Sergeevich Nickolsky; Alexander E. Baranchikov; Alexander A. Ezhov; Alsu G. Nugmanova; Yulia Yu. Enakieva; Yulia Germanovna Gorbunova; Vladimir Valentinovich Arslanov; Maria A. Kalinina. Understanding Self-Assembly of Porphyrin-Based SURMOFs: How Layered Minerals Can Be Useful. Langmuir 2018, 34, 5184 -5192.

AMA Style

Ivan Nikolaevich Meshkov, Alexandra Igorevna Zvyagina, Andrey A. Shiryaev, Maximilian Sergeevich Nickolsky, Alexander E. Baranchikov, Alexander A. Ezhov, Alsu G. Nugmanova, Yulia Yu. Enakieva, Yulia Germanovna Gorbunova, Vladimir Valentinovich Arslanov, Maria A. Kalinina. Understanding Self-Assembly of Porphyrin-Based SURMOFs: How Layered Minerals Can Be Useful. Langmuir. 2018; 34 (18):5184-5192.

Chicago/Turabian Style

Ivan Nikolaevich Meshkov; Alexandra Igorevna Zvyagina; Andrey A. Shiryaev; Maximilian Sergeevich Nickolsky; Alexander E. Baranchikov; Alexander A. Ezhov; Alsu G. Nugmanova; Yulia Yu. Enakieva; Yulia Germanovna Gorbunova; Vladimir Valentinovich Arslanov; Maria A. Kalinina. 2018. "Understanding Self-Assembly of Porphyrin-Based SURMOFs: How Layered Minerals Can Be Useful." Langmuir 34, no. 18: 5184-5192.

Journal article
Published: 19 February 2018 in MRS Advances
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Immobilization of bulk liquid high level radioactive waste (HLW) in Synroc ceramic is well-known reliable way for final isolation of dangerous long-lived radionuclides from biosphere. The alternative method of Synroc-like ceramic synthesis has been proposed. Radionuclide incorporation into crystalline titanate host-phases can be provided as a result of direct radionuclide sorption from liquid HLW using non-selective sorbent – layered hydrazinium titanate (LHT-9). Such an approach allows excluding expensive multi-stage procedure of precursor preparation. The precipitate obtained after sorption can be easily transformed into Synroc-like ceramic by cold pressing followed with sintering in air at 1000-1200°C. The highly radioactive samples of titanate ceramic loaded with real HLW have been synthesized and preliminary studied at KRI hot-cell facility. Chemical durability of this sample has been studied using static leach test in distilled water at 90°C and the leach rates for 154Eu, 241Am, 244Cm were (in g·m-2·day-1) from 2·10-4 to 5·10-3. Normalised 137Cs mass loss was 0.3 g·m-2 for 110 days at the same conditions.

ACS Style

Bella Zubekhina; B.E. Burakov; Yu.Yu. Petrov; S.N. Britvin; V.F. Mararitsa; Yu.T. Demidov; Max Nickolsky. New route for synthesis of Synroc-like ceramic using non-selective sorbent LHT-9. MRS Advances 2018, 3, 1111 -1116.

AMA Style

Bella Zubekhina, B.E. Burakov, Yu.Yu. Petrov, S.N. Britvin, V.F. Mararitsa, Yu.T. Demidov, Max Nickolsky. New route for synthesis of Synroc-like ceramic using non-selective sorbent LHT-9. MRS Advances. 2018; 3 (20):1111-1116.

Chicago/Turabian Style

Bella Zubekhina; B.E. Burakov; Yu.Yu. Petrov; S.N. Britvin; V.F. Mararitsa; Yu.T. Demidov; Max Nickolsky. 2018. "New route for synthesis of Synroc-like ceramic using non-selective sorbent LHT-9." MRS Advances 3, no. 20: 1111-1116.