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Jiuhua Chen
Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA

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Journal article
Published: 17 February 2020 in Computational Materials Science
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The critical secondary phases along with critical temperatures in regard to the creep resistance of Grade 91 steel alloy were evaluated in order to optimize the composition of the alloy to improve the creep resistance. The critical temperatures which are highlighted in this paper are Ac1 (the threshold temperature in which austinite begins to form), and Ac3 (the threshold temperature at which ferrite is fully transformed into austenite). Furthermore, optimization was presented through various Cr, V, Nb, and N concentrations in Gr.91 in relation to these critical temperatures and the mole fraction of M23C6, MX, and Z-Phase as critical secondary phases. The results indicate that increasing V and Nb will increase MX stability, whereas decreasing Cr and N lead to a decrease in Z-Phase and M23C6 stability, which may lead to an increased creep resistance of the material. Upon further analyzing the V, Nb, and N concentrations in Gr.91, results indicate that increasing Nb content in the steel can lead to an increased stability of Nb-rich MX2 carbide which can be used to replace Z-Phase in low N steels. Simulation results indicate that elimination of N with a dramatic increase in Nb concentrations result in the stability increase of only M23C6 and MX2 phases at temperature regions between 600 °C and 1370 °C and a complete removal of Z-Phase precipitation. Overall, with the elimination of N, which destabilizes Z-Phase precipitation, and an increase in Nb for NbC carbide stability, a possible solution to increasing both long-term and short-term creep resistance for Gr.91 can be achieved, though further optimization and creep experiments need to be conducted for final conclusions.

ACS Style

Andrew Smith; Mohammad Asadikiya; Jiuhua Chen; Yu Zhong. The compositional optimization and secondary phases evaluation regarding the creep resistance in Grade 91 steel through the CALPHAD approach. Computational Materials Science 2020, 177, 109591 .

AMA Style

Andrew Smith, Mohammad Asadikiya, Jiuhua Chen, Yu Zhong. The compositional optimization and secondary phases evaluation regarding the creep resistance in Grade 91 steel through the CALPHAD approach. Computational Materials Science. 2020; 177 ():109591.

Chicago/Turabian Style

Andrew Smith; Mohammad Asadikiya; Jiuhua Chen; Yu Zhong. 2020. "The compositional optimization and secondary phases evaluation regarding the creep resistance in Grade 91 steel through the CALPHAD approach." Computational Materials Science 177, no. : 109591.

Journal article
Published: 23 January 2020 in Minerals
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Goethite is a major iron-bearing sedimentary mineral on Earth. In this study, we conducted in situ high-pressure x-ray diffraction, Raman, and electrical impedance spectroscopy measurements of goethite using a diamond anvil cell (DAC) at room temperature and high pressures up to 32 GPa. We observed feature changes in both the Raman spectra and electrical resistance at about 5 and 11 GPa. However, the x-ray diffraction patterns show no structural phase transition in the entire pressure range of the study. The derived pressure-volume (P-V) data show a smooth compression curve with no clear evidence of any second-order phase transition. Fitting the volumetric data to the second-order Birch–Murnaghan equation of state yields V0 = 138.9 ± 0.5 Å3 and K0 = 126 ± 5 GPa.

ACS Style

Ruilian Tang; Jiuhua Chen; Qiaoshi Zeng; Yan Li; Xue Liang; Bin Yang; Yu Wang. Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy. Minerals 2020, 10, 99 .

AMA Style

Ruilian Tang, Jiuhua Chen, Qiaoshi Zeng, Yan Li, Xue Liang, Bin Yang, Yu Wang. Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy. Minerals. 2020; 10 (2):99.

Chicago/Turabian Style

Ruilian Tang; Jiuhua Chen; Qiaoshi Zeng; Yan Li; Xue Liang; Bin Yang; Yu Wang. 2020. "Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy." Minerals 10, no. 2: 99.

Journal article
Published: 14 October 2019 in Processes
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Iron ore was studied as a CO2 absorbent. Carbonation was carried out by mechanochemical and high temperature–high pressure (HTHP) reactions. Kinetics of the carbonation reactions was studied for the two methods. In the mechanochemical process, it was analyzed as a function of the CO2 pressure and the rotation speed of the planetary ball mill, while in the HTHP process, the kinetics was studied as a function of pressure and temperature. The highest CO2 capture capacities achieved were 3.7341 mmol of CO2/g of sorbent in ball milling (30 bar of CO2 pressure, 400 rpm, 20 h) and 5.4392 mmol of CO2/g of absorbent in HTHP (50 bar of CO2 pressure, 100 °C and 4 h). To overcome the kinetics limitations, water was introduced to all carbonation experiments. The calcination reactions were studied in Argon atmosphere using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. Siderite can be decomposed at the same temperature range (100 °C to 420 °C) for the samples produced by both methods. This range reaches higher temperatures compared with pure iron oxides due to decomposition temperature increase with decreasing purity. Calcination reactions yield magnetite and carbon. A comparison of recyclability (use of the same material in several cycles of carbonation–calcination), kinetics, spent energy, and the amounts of initial material needed to capture 1 ton of CO2, revealed the advantages of the mechanochemical process compared with HTHP.

ACS Style

Eduin Yesid Mora Mendoza; Armando Sarmiento Santos; Enrique Vera López; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent. Processes 2019, 7, 735 .

AMA Style

Eduin Yesid Mora Mendoza, Armando Sarmiento Santos, Enrique Vera López, Vadym Drozd, Andriy Durygin, Jiuhua Chen, Surendra K. Saxena. Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent. Processes. 2019; 7 (10):735.

Chicago/Turabian Style

Eduin Yesid Mora Mendoza; Armando Sarmiento Santos; Enrique Vera López; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. 2019. "Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent." Processes 7, no. 10: 735.

Journal article
Published: 30 May 2017 in DEStech Transactions on Materials Science and Engineering
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The partially ionic high pressure phase of boron γ-B28 was synthesized at 12 GPa 1500oC using a multi-anvil press. The crystal structure of γ-B28 was confirmed by x-ray diffraction. The γ-B28 phase is metastable at ambient condition. Upon grinding, the sample back transform to α-B12 phase. Optical absorption was conducted to investigate the γ-B28 sample. The optical absorption edge was observed at a wavelength of 725nm indicating a band gap of 1.7 eV for this semiconducting high pressure phase, in a good agreement with theoretical calculation (1.5-1.7 eV).

ACS Style

J. Chen; X. Liang; B. Yang; J. Girard; V. Drozd; Z. Liu. Band Gap of Semiconducting High Pressure Phase of Boron. DEStech Transactions on Materials Science and Engineering 2017, 1 .

AMA Style

J. Chen, X. Liang, B. Yang, J. Girard, V. Drozd, Z. Liu. Band Gap of Semiconducting High Pressure Phase of Boron. DEStech Transactions on Materials Science and Engineering. 2017; (msce):1.

Chicago/Turabian Style

J. Chen; X. Liang; B. Yang; J. Girard; V. Drozd; Z. Liu. 2017. "Band Gap of Semiconducting High Pressure Phase of Boron." DEStech Transactions on Materials Science and Engineering , no. msce: 1.

Comment
Published: 07 January 2016 in Science
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Jiuhua Chen. Lower-mantle materials under pressure. Science 2016, 351, 122 -123.

AMA Style

Jiuhua Chen. Lower-mantle materials under pressure. Science. 2016; 351 (6269):122-123.

Chicago/Turabian Style

Jiuhua Chen. 2016. "Lower-mantle materials under pressure." Science 351, no. 6269: 122-123.

Journal article
Published: 01 May 2014 in International Journal of Hydrogen Energy
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ACS Style

Yongzhou Sun; Jiuhua Chen; Vadym Drozd; Andriy Durigin; Shah Najiba; Xiaoyang Liu. Phase boundary of pressure-induced I4mm to Cmc21 transition in ammonia borane at elevated temperature determined using Raman spectroscopy. International Journal of Hydrogen Energy 2014, 39, 8293 -8302.

AMA Style

Yongzhou Sun, Jiuhua Chen, Vadym Drozd, Andriy Durigin, Shah Najiba, Xiaoyang Liu. Phase boundary of pressure-induced I4mm to Cmc21 transition in ammonia borane at elevated temperature determined using Raman spectroscopy. International Journal of Hydrogen Energy. 2014; 39 (16):8293-8302.

Chicago/Turabian Style

Yongzhou Sun; Jiuhua Chen; Vadym Drozd; Andriy Durigin; Shah Najiba; Xiaoyang Liu. 2014. "Phase boundary of pressure-induced I4mm to Cmc21 transition in ammonia borane at elevated temperature determined using Raman spectroscopy." International Journal of Hydrogen Energy 39, no. 16: 8293-8302.

Journal article
Published: 01 March 2014 in Physics of the Earth and Planetary Interiors
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Jiuhua Chen; Tony Yu; Shu Huang; Jennifer Girard; Xiaoyang Liu. Compressibility of liquid FeS measured using X-ray radiograph imaging. Physics of the Earth and Planetary Interiors 2014, 228, 294 -299.

AMA Style

Jiuhua Chen, Tony Yu, Shu Huang, Jennifer Girard, Xiaoyang Liu. Compressibility of liquid FeS measured using X-ray radiograph imaging. Physics of the Earth and Planetary Interiors. 2014; 228 ():294-299.

Chicago/Turabian Style

Jiuhua Chen; Tony Yu; Shu Huang; Jennifer Girard; Xiaoyang Liu. 2014. "Compressibility of liquid FeS measured using X-ray radiograph imaging." Physics of the Earth and Planetary Interiors 228, no. : 294-299.

Journal article
Published: 31 October 2012 in Proceedings of the National Academy of Sciences
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One of the major obstacles to the use of hydrogen as an energy carrier is the lack of proper hydrogen storage material. Lithium amidoborane has attracted significant attention as hydrogen storage material. It releases ∼10.9 wt% hydrogen, which is beyond the Department of Energy target, at remarkably low temperature (∼90 °C) without borazine emission. It is essential to study the bonding behavior of this potential material to improve its dehydrogenation behavior further and also to make rehydrogenation possible. We have studied the high-pressure behavior of lithium amidoborane in a diamond anvil cell using in situ Raman spectroscopy. We have discovered that there is no dihydrogen bonding in this material, as the N-H stretching modes do not show redshift with pressure. The absence of the dihydrogen bonding in this material is an interesting phenomenon, as the dihydrogen bonding is the dominant bonding feature in its parent compound ammonia borane. This observation may provide guidance to the improvement of the hydrogen storage properties of this potential material and to design new material for hydrogen storage application. Also two phase transitions were found at high pressure at 3.9 and 12.7 GPa, which are characterized by sequential changes of Raman modes.

ACS Style

S. Najiba; J. Chen. High-pressure study of lithium amidoborane using Raman spectroscopy and insight into dihydrogen bonding absence. Proceedings of the National Academy of Sciences 2012, 109, 19140 -19144.

AMA Style

S. Najiba, J. Chen. High-pressure study of lithium amidoborane using Raman spectroscopy and insight into dihydrogen bonding absence. Proceedings of the National Academy of Sciences. 2012; 109 (47):19140-19144.

Chicago/Turabian Style

S. Najiba; J. Chen. 2012. "High-pressure study of lithium amidoborane using Raman spectroscopy and insight into dihydrogen bonding absence." Proceedings of the National Academy of Sciences 109, no. 47: 19140-19144.

Journal article
Published: 01 June 2012 in Journal of Applied Physics
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ACS Style

Subrahmanyam Garimella; Vadym Drozd; Andriy Durygin; Jiuhua Chen. High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl. Journal of Applied Physics 2012, 111, 112606 .

AMA Style

Subrahmanyam Garimella, Vadym Drozd, Andriy Durygin, Jiuhua Chen. High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl. Journal of Applied Physics. 2012; 111 (11):112606.

Chicago/Turabian Style

Subrahmanyam Garimella; Vadym Drozd; Andriy Durygin; Jiuhua Chen. 2012. "High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl." Journal of Applied Physics 111, no. 11: 112606.

Journal article
Published: 01 June 2012 in Journal of Applied Physics
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ACS Style

Shah Najiba; Jiuhua Chen; Vadym Drozd; Andriy Durygin; Yongzhou Sun. Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure. Journal of Applied Physics 2012, 111, 112618 .

AMA Style

Shah Najiba, Jiuhua Chen, Vadym Drozd, Andriy Durygin, Yongzhou Sun. Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure. Journal of Applied Physics. 2012; 111 (11):112618.

Chicago/Turabian Style

Shah Najiba; Jiuhua Chen; Vadym Drozd; Andriy Durygin; Yongzhou Sun. 2012. "Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure." Journal of Applied Physics 111, no. 11: 112618.

Journal article
Published: 01 June 2012 in Journal of Applied Physics
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ACS Style

Jiuhua Chen; Haozhe Liu; Naurang L. Saini. Preface to Special Topic: Selected Papers from the International Conference on the Study of Matter at Extreme Conditions, SMEC 2011. Journal of Applied Physics 2012, 111, 112501 .

AMA Style

Jiuhua Chen, Haozhe Liu, Naurang L. Saini. Preface to Special Topic: Selected Papers from the International Conference on the Study of Matter at Extreme Conditions, SMEC 2011. Journal of Applied Physics. 2012; 111 (11):112501.

Chicago/Turabian Style

Jiuhua Chen; Haozhe Liu; Naurang L. Saini. 2012. "Preface to Special Topic: Selected Papers from the International Conference on the Study of Matter at Extreme Conditions, SMEC 2011." Journal of Applied Physics 111, no. 11: 112501.

Journal article
Published: 30 June 2011 in Scripta Materialia
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We present the measurement of the Young’s modulus (E) of a nanopolycrystalline diamond (NPD) sample synthesized by the direct conversion of graphite under high pressure and temperature. E has been measured along with the nanohardness (HN) using the nanoindentation technique (E = 707 GPa and HN = 62 GPa). Comparing E and HN of NPD with other commercially available superhard anvils and polycrystalline diamonds, we demonstrate its greater hardness and elastic properties.

ACS Style

Hélène Couvy; Debrupa Lahiri; Jiuhua Chen; Arvind Agarwal; Gautam Sen. Nanohardness and Young’s modulus of nanopolycrystalline diamond. Scripta Materialia 2011, 64, 1019 -1022.

AMA Style

Hélène Couvy, Debrupa Lahiri, Jiuhua Chen, Arvind Agarwal, Gautam Sen. Nanohardness and Young’s modulus of nanopolycrystalline diamond. Scripta Materialia. 2011; 64 (11):1019-1022.

Chicago/Turabian Style

Hélène Couvy; Debrupa Lahiri; Jiuhua Chen; Arvind Agarwal; Gautam Sen. 2011. "Nanohardness and Young’s modulus of nanopolycrystalline diamond." Scripta Materialia 64, no. 11: 1019-1022.

Journal article
Published: 31 October 2010 in International Journal of Hydrogen Energy
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In situ synchrotron X-ray diffraction experiments of ammonia borane synthesized using sonication assisted direct reaction (sodium borohydride and ammonium formate) were performed under high pressures up to 23 GPa at ambient temperature and up to 4 GPa at elevated temperatures (300 K–505 K). At ambient temperature, one first order phase transition (I4mm to Cmc21) was observed at 1.3 GPa and one second order phase transition was observed at about 5 GPa. Fitting the measured volumetric compression data to the third order Birch–Murnaghan equation of state reveals a bulk modulus of K = 9.3 ± 0.4 GPa (K′ = 4.8) for the I4mm phase, K = 11.9 ± 0.5 GPa (K′ = 4.6) for the Cmc21 phase below 5 GPa, and K = 37 ± 4 GPa (K′ = 4.6) for pressure above 5 GPa. There is a 6% volume drop at the first order phase transition. Transition pressures from I4mm to Cmc21 phases were determined at elevated temperatures. The phase boundary has a negative Clapeyron slope of −1.67 MPa/K. The experiments also reveal a new structural transition when temperature increases to 450 K at 4 GPa.

ACS Style

Jiuhua Chen; Helene Couvy; Haozhe Liu; Vadym Drozd; Luke L. Daemen; Yusheng Zhao; Chi-Chang Kao. In situ X-ray study of ammonia borane at high pressures. International Journal of Hydrogen Energy 2010, 35, 11064 -11070.

AMA Style

Jiuhua Chen, Helene Couvy, Haozhe Liu, Vadym Drozd, Luke L. Daemen, Yusheng Zhao, Chi-Chang Kao. In situ X-ray study of ammonia borane at high pressures. International Journal of Hydrogen Energy. 2010; 35 (20):11064-11070.

Chicago/Turabian Style

Jiuhua Chen; Helene Couvy; Haozhe Liu; Vadym Drozd; Luke L. Daemen; Yusheng Zhao; Chi-Chang Kao. 2010. "In situ X-ray study of ammonia borane at high pressures." International Journal of Hydrogen Energy 35, no. 20: 11064-11070.

Journal article
Published: 19 March 2010 in Journal of Physics and Chemistry of Solids
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ACS Style

Srinija Repalle; Jiuhua Chen; Vadym Drozd; Wonbong Choi. The Raman spectroscopic studies of aligned MWCNTs treated under high pressure and high temperature. Journal of Physics and Chemistry of Solids 2010, 71, 1150 -1153.

AMA Style

Srinija Repalle, Jiuhua Chen, Vadym Drozd, Wonbong Choi. The Raman spectroscopic studies of aligned MWCNTs treated under high pressure and high temperature. Journal of Physics and Chemistry of Solids. 2010; 71 (8):1150-1153.

Chicago/Turabian Style

Srinija Repalle; Jiuhua Chen; Vadym Drozd; Wonbong Choi. 2010. "The Raman spectroscopic studies of aligned MWCNTs treated under high pressure and high temperature." Journal of Physics and Chemistry of Solids 71, no. 8: 1150-1153.

Preprint
Published: 04 August 2009
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The comment of Dubrovinskaia et al. is scientifically flawed. The high-pressure form of boron, discovered by Oganov et al., is indeed new and its bonding has a significant ionic character, as demonstrated in Ref. 1.

ACS Style

Artem R. Oganov; Jiuhua Chen; Carlo Gatti; Yanzhang Ma; Yanming Ma; Colin W. Glass; Zhenxian Liu; Tony Yu; Oleksandr O. Kurakevych; Vladimir L. Solozhenko. New high-pressure form of boron is significantly ionic. 2009, 1 .

AMA Style

Artem R. Oganov, Jiuhua Chen, Carlo Gatti, Yanzhang Ma, Yanming Ma, Colin W. Glass, Zhenxian Liu, Tony Yu, Oleksandr O. Kurakevych, Vladimir L. Solozhenko. New high-pressure form of boron is significantly ionic. . 2009; ():1.

Chicago/Turabian Style

Artem R. Oganov; Jiuhua Chen; Carlo Gatti; Yanzhang Ma; Yanming Ma; Colin W. Glass; Zhenxian Liu; Tony Yu; Oleksandr O. Kurakevych; Vladimir L. Solozhenko. 2009. "New high-pressure form of boron is significantly ionic." , no. : 1.

Journal article
Published: 31 May 2009 in International Journal of Hydrogen Energy
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Mg2FeH6 was synthesized by ball milling MgH2 and Fe (2:1 molar ratio) mixture for 72 h followed by heating at 400 °C under H2 pressure. The hydride formation, its structure and homogeneity were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Raman spectroscopy. High pressure in situ synchrotron X-ray diffraction and Vienna ab initio simulation were used to determine bulk modulus of the sample. The bulk modulus of Mg2FeH6 was found to be 75.4(4) GPa by optimized experiment and 76.3 GPa by theoretical simulation. From high temperature in situ X-ray diffraction study the volumetric thermal expansion coefficient of Mg2FeH6 was found to be αv = 5.85(3) × 10−5 + 7.47(7) × 10−8 (T − To)/°C. Decomposition of Mg2FeH6 was observed at 425 °C and the decomposition products were Mg, Fe and H2.

ACS Style

Lyci George; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies. International Journal of Hydrogen Energy 2009, 34, 3410 -3416.

AMA Style

Lyci George, Vadym Drozd, Andriy Durygin, Jiuhua Chen, Surendra K. Saxena. Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies. International Journal of Hydrogen Energy. 2009; 34 (8):3410-3416.

Chicago/Turabian Style

Lyci George; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. 2009. "Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies." International Journal of Hydrogen Energy 34, no. 8: 3410-3416.

Journal article
Published: 01 September 2008 in High Pressure Research
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The strength of boron suboxide (B6O) was measured at high pressure and temperature up to 8 GPa and 800°C using diffraction peak broadening analysis. The sample was synthesized at 6 GPa and 1750°C. In situ energy dispersive X-ray diffraction was conducted at the X17B2 beamline of the National Synchrotron Light Source. The differential stress in the powdered sample was derived through deconvolution of peak broadening of diffraction lines (0 2 1) and (1 1 3) during the compression and heating. The sample shows anisotropic yielding along the two orientations. The (0 2 1) orientation does not show yielding within the investigated pressure range (8 GPa) whereas the (1 1 3) orientation yields at 5 GPa. Upon heating, significant weakening (yielding) was observed at temperatures above 400°C. The yield temperature of boron suboxide is much lower than that of diamond, 1200°C, but similar to that observed in moissanite (SiC).

ACS Style

Jiuhua Chen; Yunpeng Yang; Tony Yu; Jianzhong Zhang; Yusheng Zhao; Liping Wang. Strength measurement of boron suboxide B6O at high pressure and temperature using in situ synchrotron X-ray diffraction. High Pressure Research 2008, 28, 423 -430.

AMA Style

Jiuhua Chen, Yunpeng Yang, Tony Yu, Jianzhong Zhang, Yusheng Zhao, Liping Wang. Strength measurement of boron suboxide B6O at high pressure and temperature using in situ synchrotron X-ray diffraction. High Pressure Research. 2008; 28 (3):423-430.

Chicago/Turabian Style

Jiuhua Chen; Yunpeng Yang; Tony Yu; Jianzhong Zhang; Yusheng Zhao; Liping Wang. 2008. "Strength measurement of boron suboxide B6O at high pressure and temperature using in situ synchrotron X-ray diffraction." High Pressure Research 28, no. 3: 423-430.

Journal article
Published: 01 October 2006 in American Mineralogist
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Neighborite (NaMgF3) with the perovskite structure, transforms to a post-perovskite (ppv) phase between 27 and 30 GPa. The ppv phase is observed to the highest pressures achieved (56 GPa) at room temperature and transforms to an as yet unknown phase upon heating. Rietveld structure refinement using monochromatic synchrotron X-ray diffraction data provide models for the perovskite and post-perovskite structures at high pressure. The refined models at 27(1) GPa indicate some inter-octahedral F-F distances rival the average intra-octahedral distance, which may cause instability in the perovskite structure and drive the transformation to the post-perovskite phase. The ratio of A-site to B-site volume (VA/VB) in perovskite structured NaMgF3 (ABX3), spans from 5 in the zero-pressure high-temperature cubic perovskite phase to 4 in this high-pressure perovskite phase at 27(1) GPa, matching the VA/VB value in post-perovskite NaMgF3. Using Rietveld refinement on post-perovskite structure models, we observe discrepancies in pattern fitting, which may be described in terms of development of sample texture in the diamond-anvil cell, recrystallization, or a change of space group to Cmc21, a non-isomorphic subgroup of Cmcm—the space group describing the structure of CaIrO3.

ACS Style

C. David Martin; Wilson A. Crichton; Haozhe Liu; Vitali Prakapenka; Jiuhua Chen; John B. Parise. Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (Neighborite) at high pressures. American Mineralogist 2006, 91, 1703 -1706.

AMA Style

C. David Martin, Wilson A. Crichton, Haozhe Liu, Vitali Prakapenka, Jiuhua Chen, John B. Parise. Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (Neighborite) at high pressures. American Mineralogist. 2006; 91 (10):1703-1706.

Chicago/Turabian Style

C. David Martin; Wilson A. Crichton; Haozhe Liu; Vitali Prakapenka; Jiuhua Chen; John B. Parise. 2006. "Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (Neighborite) at high pressures." American Mineralogist 91, no. 10: 1703-1706.

Journal article
Published: 01 October 2005 in American Mineralogist
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The crystal structure of NaMgF3 perovskite (neighborite) has been studied at 4 GPa and temperatures up to 1000 °C using the Rietveld structure-refinement method. In situ synchrotron X-ray powder diffraction data was collected using monochromatic radiation. The orthorhombic (Pbnm) to cubic (Pm3̅m) transition was observed when the temperature increased from 900 to 1000 °C. Structure refinements show that the ratio of polyhedral volumes of the A and B sites (VA/VB) of the orthorhombic phase increases with temperature, approaching the ideal value (5) for the cubic structure. However, this ratio becomes smaller at 4 GPa compared to the result from previous studies at the same temperature but ambient pressure, indicating that pressure makes it more difficult to transform from the orthorhombic phase to the cubic phase in this kind of perovskite.

ACS Style

Jiuhua Chen; Haozhe Liu; C. David Martin; John B. Parise; Donald J. Weidner. Crystal chemistry of NaMgF3 perovskite at high pressure and temperature. American Mineralogist 2005, 90, 1534 -1539.

AMA Style

Jiuhua Chen, Haozhe Liu, C. David Martin, John B. Parise, Donald J. Weidner. Crystal chemistry of NaMgF3 perovskite at high pressure and temperature. American Mineralogist. 2005; 90 (10):1534-1539.

Chicago/Turabian Style

Jiuhua Chen; Haozhe Liu; C. David Martin; John B. Parise; Donald J. Weidner. 2005. "Crystal chemistry of NaMgF3 perovskite at high pressure and temperature." American Mineralogist 90, no. 10: 1534-1539.

Book chapter
Published: 01 January 2005 in Advances in High-Pressure Technology for Geophysical Applications
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Yoshitaka Aizawa; Jeffrey R. Allwardt; R. Ando; Ross J. Angel; Krassimir N. Bozhilov; Robert C. Burruss; Jiuhua Chen; I-Ming Chou; George D. Cody; Wilson A. Crichton; Jonathan C. Crowhurst; Luke. L. Daemen; Larissa F. Dobrzhinetskaya; Natalia Dubrovinskaia; Leonid Dubrovinsky; William Durham; Yingwei Fei; Daniel J. Frost; Ken-Ichi Funakoshi; Stuart A. Gilder; Alexander F. Goncharov; Harry W. Green; Duanwei He; Russell J. Hemley; Eiji Ito; Ian Jackson; Steven D. Jacobsen; Hiroshi Kaneko; Anastasia Kantor; Innokenty Kantor; Shun-Ichiro Karato; Y. Katayama; Tomoo Katsura; Kazuyuki Kawabe; Atsushi Kubo; Jennifer Kung; Alexei Kuznetsov; Christian Lathe; Joern Lauterjung; Maxime LeGoff; Baosheng Li; Li Li; Jung-Fu Lin; Konstantin A. Lokshin; Wanjun Lu; Ho-Kwang Mao; Mohamed Mezouar; Hans J. Mueller; Bjorn O. Mysen; Yu Nishihara; Norimasa Nishiyama; Akifumi Nozawa; E. Ohtani; Takuo Okuchi; Cristian Pantea; Jiang Qian; Hans J. Reichmann; Alex P. Renfro; Mark L. Rivers; Mario Santoro; Frank R. Schilling; Burkhard C. Schmidt; Guoyin Shen; Hartmut A. Spetzler; Jonathan F. Stebbins; Viktor V. Struzhkin; Wolfgang Sturhahn; Sung Keun Lee; Steve R. Sutton; A. Suzuki; Takeyuki Uchida; S. Urakawa; Michael T. Vaughan; Robert Von Dreele; Liping Wang; Yanbin Wang; Donald J. Weidner; Yousheng Xu; Sho Yokoshi; Christopher E. Young; Joseph M. Zaug; Jianzhong Zhang; Jiyong Zhao; Yusheng Zhao. Contributors. Advances in High-Pressure Technology for Geophysical Applications 2005, 1 .

AMA Style

Yoshitaka Aizawa, Jeffrey R. Allwardt, R. Ando, Ross J. Angel, Krassimir N. Bozhilov, Robert C. Burruss, Jiuhua Chen, I-Ming Chou, George D. Cody, Wilson A. Crichton, Jonathan C. Crowhurst, Luke. L. Daemen, Larissa F. Dobrzhinetskaya, Natalia Dubrovinskaia, Leonid Dubrovinsky, William Durham, Yingwei Fei, Daniel J. Frost, Ken-Ichi Funakoshi, Stuart A. Gilder, Alexander F. Goncharov, Harry W. Green, Duanwei He, Russell J. Hemley, Eiji Ito, Ian Jackson, Steven D. Jacobsen, Hiroshi Kaneko, Anastasia Kantor, Innokenty Kantor, Shun-Ichiro Karato, Y. Katayama, Tomoo Katsura, Kazuyuki Kawabe, Atsushi Kubo, Jennifer Kung, Alexei Kuznetsov, Christian Lathe, Joern Lauterjung, Maxime LeGoff, Baosheng Li, Li Li, Jung-Fu Lin, Konstantin A. Lokshin, Wanjun Lu, Ho-Kwang Mao, Mohamed Mezouar, Hans J. Mueller, Bjorn O. Mysen, Yu Nishihara, Norimasa Nishiyama, Akifumi Nozawa, E. Ohtani, Takuo Okuchi, Cristian Pantea, Jiang Qian, Hans J. Reichmann, Alex P. Renfro, Mark L. Rivers, Mario Santoro, Frank R. Schilling, Burkhard C. Schmidt, Guoyin Shen, Hartmut A. Spetzler, Jonathan F. Stebbins, Viktor V. Struzhkin, Wolfgang Sturhahn, Sung Keun Lee, Steve R. Sutton, A. Suzuki, Takeyuki Uchida, S. Urakawa, Michael T. Vaughan, Robert Von Dreele, Liping Wang, Yanbin Wang, Donald J. Weidner, Yousheng Xu, Sho Yokoshi, Christopher E. Young, Joseph M. Zaug, Jianzhong Zhang, Jiyong Zhao, Yusheng Zhao. Contributors. Advances in High-Pressure Technology for Geophysical Applications. 2005; ():1.

Chicago/Turabian Style

Yoshitaka Aizawa; Jeffrey R. Allwardt; R. Ando; Ross J. Angel; Krassimir N. Bozhilov; Robert C. Burruss; Jiuhua Chen; I-Ming Chou; George D. Cody; Wilson A. Crichton; Jonathan C. Crowhurst; Luke. L. Daemen; Larissa F. Dobrzhinetskaya; Natalia Dubrovinskaia; Leonid Dubrovinsky; William Durham; Yingwei Fei; Daniel J. Frost; Ken-Ichi Funakoshi; Stuart A. Gilder; Alexander F. Goncharov; Harry W. Green; Duanwei He; Russell J. Hemley; Eiji Ito; Ian Jackson; Steven D. Jacobsen; Hiroshi Kaneko; Anastasia Kantor; Innokenty Kantor; Shun-Ichiro Karato; Y. Katayama; Tomoo Katsura; Kazuyuki Kawabe; Atsushi Kubo; Jennifer Kung; Alexei Kuznetsov; Christian Lathe; Joern Lauterjung; Maxime LeGoff; Baosheng Li; Li Li; Jung-Fu Lin; Konstantin A. Lokshin; Wanjun Lu; Ho-Kwang Mao; Mohamed Mezouar; Hans J. Mueller; Bjorn O. Mysen; Yu Nishihara; Norimasa Nishiyama; Akifumi Nozawa; E. Ohtani; Takuo Okuchi; Cristian Pantea; Jiang Qian; Hans J. Reichmann; Alex P. Renfro; Mark L. Rivers; Mario Santoro; Frank R. Schilling; Burkhard C. Schmidt; Guoyin Shen; Hartmut A. Spetzler; Jonathan F. Stebbins; Viktor V. Struzhkin; Wolfgang Sturhahn; Sung Keun Lee; Steve R. Sutton; A. Suzuki; Takeyuki Uchida; S. Urakawa; Michael T. Vaughan; Robert Von Dreele; Liping Wang; Yanbin Wang; Donald J. Weidner; Yousheng Xu; Sho Yokoshi; Christopher E. Young; Joseph M. Zaug; Jianzhong Zhang; Jiyong Zhao; Yusheng Zhao. 2005. "Contributors." Advances in High-Pressure Technology for Geophysical Applications , no. : 1.