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Dr. Jianqi Xi
Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, USA

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0 STEM education
0 Computational Fluid Dynamics
0 Nuclear power plant safety evaluation
0 Accident tolerant fuels/cladding/coating

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Research article
Published: 25 June 2021 in Science Advances
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In metallic systems, increasing the density of interfaces has been shown to be a promising strategy for annealing defects introduced during irradiation. The role of interfaces during irradiation of ceramics is more unclear because of the complex defect energy landscape that exists in these materials. Here, we report the effects of interfaces on radiation-induced phase transformation and chemical composition changes in SiC-Ti3SiC2-TiC x multilayer materials based on combined transmission electron microscopy (TEM) analysis and first-principles calculations. We found that the undesirable phase transformation of Ti3SiC2 is substantially enhanced near the SiC/Ti3SiC2 interface, and it is suppressed near the Ti3SiC2/TiC interface. The results have been explained by ab initio calculations of trends in defect segregation to the above interfaces. Our finding suggests that the phase stability of Ti3SiC2 under irradiation can be improved by adding TiC x , and it demonstrates that, in ceramics, interfaces are not necessarily beneficial to radiation resistance.

ACS Style

Hongliang Zhang; Jianqi Xi; Ranran Su; Xuanxin Hu; Jun Young Kim; Shuguang Wei; Chenyu Zhang; Liqun Shi; Izabela Szlufarska. Enhancing the phase stability of ceramics under radiation via multilayer engineering. Science Advances 2021, 7, eabg7678 .

AMA Style

Hongliang Zhang, Jianqi Xi, Ranran Su, Xuanxin Hu, Jun Young Kim, Shuguang Wei, Chenyu Zhang, Liqun Shi, Izabela Szlufarska. Enhancing the phase stability of ceramics under radiation via multilayer engineering. Science Advances. 2021; 7 (26):eabg7678.

Chicago/Turabian Style

Hongliang Zhang; Jianqi Xi; Ranran Su; Xuanxin Hu; Jun Young Kim; Shuguang Wei; Chenyu Zhang; Liqun Shi; Izabela Szlufarska. 2021. "Enhancing the phase stability of ceramics under radiation via multilayer engineering." Science Advances 7, no. 26: eabg7678.

Journal article
Published: 13 March 2021 in Acta Materialia
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Water-solid interfacial reactions are critical to understanding corrosion. More specifically, it is notoriously difficult to determine how water and solid interact beyond the initial chemisorption to induce the surface dissolution. Here, we report atomic-scale mechanisms of the elementary steps during SiC hydrothermal corrosion – from the initial surface attack to surface dissolution. We find that hydrogen scission reactions play a vital role in breaking Si-C bonds, regardless of the surface orientations. Stable silica layer does not form on the surface, but the newly identified chemical reactions on SiC are analogous to those observed during the dissolution of silica. SiC is dissolved directly into the water as soluble silicic acid. The rate of hydrothermal corrosion determined based on the calculated reaction activation energies is consistent with available experimental data. Our work sheds new light on understanding and interpreting the experimental observations and it provides foundation for design of materials that are resistant to corrosion in water.

ACS Style

Jianqi Xi; Cheng Liu; Dane Morgan; Izabela Szlufarska. Deciphering water-solid reactions during hydrothermal corrosion of SiC. Acta Materialia 2021, 209, 116803 .

AMA Style

Jianqi Xi, Cheng Liu, Dane Morgan, Izabela Szlufarska. Deciphering water-solid reactions during hydrothermal corrosion of SiC. Acta Materialia. 2021; 209 ():116803.

Chicago/Turabian Style

Jianqi Xi; Cheng Liu; Dane Morgan; Izabela Szlufarska. 2021. "Deciphering water-solid reactions during hydrothermal corrosion of SiC." Acta Materialia 209, no. : 116803.

Journal article
Published: 05 August 2020 in Computational Materials Science
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The icosahedral-like polyhedral fraction (ICO-like fraction) has been studied as a criterion for predicting the glass-forming ability of bulk ternary metallic glasses, Al90Sm8X2 (X = Al (binary), Cu, Ag, Au), using ab initio molecular dynamics (AIMD) simulations. We found that the ICO-like fraction can be determined with adequate precision to explore correlations with AIMD simulations. We then demonstrated that ICO-like fraction correlates with the critical cooling rate, which is a widely used intrinsic measure of glass forming ability. These results suggest that the ICO-like fraction from AIMD simulations may offer a useful guide for searching and screening for good glass formers.

ACS Style

J. Xi; G. Bokas; L.E. Schultz; M. Gao; L. Zhao; Y. Shen; J.H. Perepezko; D. Morgan; I. Szlufarska. Microalloying effect in ternary Al-Sm-X (X = Ag, Au, Cu) metallic glasses studied by ab initio molecular dynamics. Computational Materials Science 2020, 185, 109958 .

AMA Style

J. Xi, G. Bokas, L.E. Schultz, M. Gao, L. Zhao, Y. Shen, J.H. Perepezko, D. Morgan, I. Szlufarska. Microalloying effect in ternary Al-Sm-X (X = Ag, Au, Cu) metallic glasses studied by ab initio molecular dynamics. Computational Materials Science. 2020; 185 ():109958.

Chicago/Turabian Style

J. Xi; G. Bokas; L.E. Schultz; M. Gao; L. Zhao; Y. Shen; J.H. Perepezko; D. Morgan; I. Szlufarska. 2020. "Microalloying effect in ternary Al-Sm-X (X = Ag, Au, Cu) metallic glasses studied by ab initio molecular dynamics." Computational Materials Science 185, no. : 109958.

Journal article
Published: 08 July 2020 in Acta Materialia
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MAB phases are a new class of layered ternary materials that have already shown a number of outstanding properties. Here, we investigate defect evolution and radiation tolerance of two MAB phases, MoAlB and Fe2AlB2, using a combination of experimental characterization and first-principles calculations. We find that Fe2AlB2 is more tolerant to radiation-induced amorphization than MoAlB, both at 150 °C and at 300 °C. The results can be explained by the fact that the Mo Frenkel pair is unstable in MoAlB and as a result, irradiated MoAlB is expected to have a significant concentration of MoAl antisites, which are difficult to anneal even at 300 °C. We find that the tolerance to radiation-induced amorphization of MAB phases is lower than in MAX phases, but it is comparable to that of SiC. However, MAB phases do not show radiation-induced cracking which is observed in MAX phases under the same irradiation conditions. This study suggests that MAB phases might be a promising class of materials for applications that involve radiation.

ACS Style

Hongliang Zhang; Jun Young Kim; Ranran Su; Peter Richardson; Jianqi Xi; Erich Kisi; John O'Connor; Liqun Shi; Izabela Szlufarska. Defect behavior and radiation tolerance of MAB phases (MoAlB and Fe2AlB2) with comparison to MAX phases. Acta Materialia 2020, 196, 505 -515.

AMA Style

Hongliang Zhang, Jun Young Kim, Ranran Su, Peter Richardson, Jianqi Xi, Erich Kisi, John O'Connor, Liqun Shi, Izabela Szlufarska. Defect behavior and radiation tolerance of MAB phases (MoAlB and Fe2AlB2) with comparison to MAX phases. Acta Materialia. 2020; 196 ():505-515.

Chicago/Turabian Style

Hongliang Zhang; Jun Young Kim; Ranran Su; Peter Richardson; Jianqi Xi; Erich Kisi; John O'Connor; Liqun Shi; Izabela Szlufarska. 2020. "Defect behavior and radiation tolerance of MAB phases (MoAlB and Fe2AlB2) with comparison to MAX phases." Acta Materialia 196, no. : 505-515.

Research article
Published: 02 April 2020 in The Journal of Physical Chemistry C
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During the aqueous corrosion, atoms in the solid react chemically with oxygen, leading either to the formation of an oxide film or to the dissolution of the host material. Commonly, the first step in corrosion involves an oxygen atom from the dissociated water reacting with the surface atoms and breaking near-surface bonds. In contrast, hydrogen on the surface often functions as a passivating species. Here, we discovered that the roles of O and H are reversed in the early corrosion stages on a Si-terminated SiC surface. O forms stable species on the surface and chemical attack occurs by H breaking Si-C bonds. This so-called hydrogen scission reaction is enabled by a newly discovered metastable bridging hydroxyl group that can form during water dissociation. Si atom displaced from the surface during water attack subsequently forms H2SiO3, which is a known precursor to formation of silica and of silicic acid. This study suggests that the roles of H and O in oxidation need to be reconsidered.

ACS Style

Jianqi Xi; Cheng Liu; Dane Morgan; Izabela Szlufarska. An Unexpected Role of H During SiC Corrosion in Water. The Journal of Physical Chemistry C 2020, 124, 9394 -9400.

AMA Style

Jianqi Xi, Cheng Liu, Dane Morgan, Izabela Szlufarska. An Unexpected Role of H During SiC Corrosion in Water. The Journal of Physical Chemistry C. 2020; 124 (17):9394-9400.

Chicago/Turabian Style

Jianqi Xi; Cheng Liu; Dane Morgan; Izabela Szlufarska. 2020. "An Unexpected Role of H During SiC Corrosion in Water." The Journal of Physical Chemistry C 124, no. 17: 9394-9400.

Journal article
Published: 04 March 2020 in Carbon
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In nanocomposites, improved mechanical performance is critically linked to understanding and controlling interfacial properties. In the work reported here, ion implantation is introduced as a new method for tailoring the complex nanoscale interfaces between multiwall carbon nanotubes (MWCNTs) and a ceramic matrix. The results show that surface layers of the nanocomposite with high toughness can be created with C2+ ions. This enhanced toughening due to ion implantation is associated with large compressive stresses in the MWCNTs and with significant changes in the carbon structure. These observations are consistent with molecular dynamics (MD) simulations, which indicate that partial amorphization of the MWCNTs is enhanced by the compressive stress and confinement within the ceramic matrix. This work opens up new opportunities for using ion implantation to create a new class of exceptionally tough ceramic nanocomposites.

ACS Style

Christos E. Athanasiou; Hongliang Zhang; Cristina Ramirez; Jianqi Xi; Tomonori Baba; Xing Wang; Wei Zhang; Nitin P. Padture; Izabela Szlufarska; Brian W. Sheldon. High toughness carbon-nanotube-reinforced ceramics via ion-beam engineering of interfaces. Carbon 2020, 163, 169 -177.

AMA Style

Christos E. Athanasiou, Hongliang Zhang, Cristina Ramirez, Jianqi Xi, Tomonori Baba, Xing Wang, Wei Zhang, Nitin P. Padture, Izabela Szlufarska, Brian W. Sheldon. High toughness carbon-nanotube-reinforced ceramics via ion-beam engineering of interfaces. Carbon. 2020; 163 ():169-177.

Chicago/Turabian Style

Christos E. Athanasiou; Hongliang Zhang; Cristina Ramirez; Jianqi Xi; Tomonori Baba; Xing Wang; Wei Zhang; Nitin P. Padture; Izabela Szlufarska; Brian W. Sheldon. 2020. "High toughness carbon-nanotube-reinforced ceramics via ion-beam engineering of interfaces." Carbon 163, no. : 169-177.

Research article
Published: 17 April 2019 in The Journal of Physical Chemistry C
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Molecular dynamics simulations of dry oxidation of bicrystals with incoherent and coherent grain boundaries (GBs) in 3C-SiC are performed at 2000 K and the results are compared to oxidation of single crystal SiC. Oxidation near incoherent GBs is found faster than that in single crystals and in coherent GBs, whereas oxidation of coherent GBs is comparable to that of single crystal. The accelerated oxidation near incoherent GBs is attributed to strain and the presence of under-coordinated Si within the GB region, which both reduce the positive charge on silicon atoms, making them more reactive with oxygen. Although atoms with similar properties are found in dislocation cores of coherent GBs, dislocation cores are isolated from each other by crystalline regions, which in turn control the rate of oxidation.

ACS Style

Cheng Liu; Jianqi Xi; Izabela Szlufarska. Sensitivity of SiC Grain Boundaries to Oxidation. The Journal of Physical Chemistry C 2019, 123, 11546 -11554.

AMA Style

Cheng Liu, Jianqi Xi, Izabela Szlufarska. Sensitivity of SiC Grain Boundaries to Oxidation. The Journal of Physical Chemistry C. 2019; 123 (18):11546-11554.

Chicago/Turabian Style

Cheng Liu; Jianqi Xi; Izabela Szlufarska. 2019. "Sensitivity of SiC Grain Boundaries to Oxidation." The Journal of Physical Chemistry C 123, no. 18: 11546-11554.

Journal article
Published: 30 October 2018 in Corrosion Science
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Corrosion of Si, C, and SiC in fluoride salt has been studied byab initio molecular dynamics. The standard dissolution potential for Si is found to be smaller (easier to corrode) than that of C. The dissolved Si attracts F-ions and forms SiF62-, whereas the dissolved C species forms neutral CF4molecules. A swapping mechanism is identified for the initial corrosion stage, where Si first comes to the surface and then is dissolved, leaving behind chain- and ring-like C structures. A strategy to suppress SiC corrosion is also discussed based on Be doping, including avoiding Be2C formation.

ACS Style

Jianqi Xi; Hao Jiang; Cheng Liu; Dane Morgan; Izabela Szlufarska. Corrosion of Si, C, and SiC in molten salt. Corrosion Science 2018, 146, 1 -9.

AMA Style

Jianqi Xi, Hao Jiang, Cheng Liu, Dane Morgan, Izabela Szlufarska. Corrosion of Si, C, and SiC in molten salt. Corrosion Science. 2018; 146 ():1-9.

Chicago/Turabian Style

Jianqi Xi; Hao Jiang; Cheng Liu; Dane Morgan; Izabela Szlufarska. 2018. "Corrosion of Si, C, and SiC in molten salt." Corrosion Science 146, no. : 1-9.

Journal article
Published: 12 March 2018 in Journal of Physics: Condensed Matter
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The modification of the local structure in cubic perovskite KTaO3 irradiated with 3 MeV and 1.1 GeV Au ions is studied by Raman and x-ray absorption spectroscopy, complemented by density functional theory (DFT) calculations. In the case of irradiation with 3 MeV Au ions where displacement cascade processes are dominant, the Ta L3-edge x-ray absorption measurements suggest that a peak corresponding to the Ta-O bonds in the TaO6 octahedra splits, which is attributed to the formation of TaK antisite defects that are coupled with oxygen vacancies, V O. This finding is consistent with the DFT calculations. Under irradiation with 1.1 GeV ions, the intense ionization and electronic energy deposition lead to a blue shift and an intensity reduction of active Raman bands. In the case of sequential irradiations, extended x-ray absorption fine structure measurements reveal a decrease in concentration of coupled TaK-V O defects under subsequent irradiation with 1.1 GeV Au ions.

ACS Style

F X Zhang; Jianqi Xi; Yanwen Zhang; Yang Tong; Haizhou Xue; Rong Huang; Christina Trautmann; William Weber. Local structure and defects in ion irradiated KTaO3. Journal of Physics: Condensed Matter 2018, 30, 145401 .

AMA Style

F X Zhang, Jianqi Xi, Yanwen Zhang, Yang Tong, Haizhou Xue, Rong Huang, Christina Trautmann, William Weber. Local structure and defects in ion irradiated KTaO3. Journal of Physics: Condensed Matter. 2018; 30 (14):145401.

Chicago/Turabian Style

F X Zhang; Jianqi Xi; Yanwen Zhang; Yang Tong; Haizhou Xue; Rong Huang; Christina Trautmann; William Weber. 2018. "Local structure and defects in ion irradiated KTaO3." Journal of Physics: Condensed Matter 30, no. 14: 145401.

Journal article
Published: 01 February 2018 in Journal of Nuclear Materials
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ACS Style

Jianqi Xi; Bin Liu; Haixuan Xu; Yanwen Zhang; William J. Weber. Determination of gaseous fission product behavior near the cerium dioxide Σ3 (111)/[11¯0] tilt grain boundary via first-principles study. Journal of Nuclear Materials 2018, 499, 377 -382.

AMA Style

Jianqi Xi, Bin Liu, Haixuan Xu, Yanwen Zhang, William J. Weber. Determination of gaseous fission product behavior near the cerium dioxide Σ3 (111)/[11¯0] tilt grain boundary via first-principles study. Journal of Nuclear Materials. 2018; 499 ():377-382.

Chicago/Turabian Style

Jianqi Xi; Bin Liu; Haixuan Xu; Yanwen Zhang; William J. Weber. 2018. "Determination of gaseous fission product behavior near the cerium dioxide Σ3 (111)/[11¯0] tilt grain boundary via first-principles study." Journal of Nuclear Materials 499, no. : 377-382.

Journal article
Published: 28 January 2018 in Journal of Applied Physics
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Ab initio molecular dynamics simulations of low energy recoil events in wurtzite AlN have been performed to determine threshold displacement energies, defect production and evolution mechanisms, role of partial charge transfer during the process, and the influence of irradiation-induced defects on the properties of AlN. The results show that the threshold displacement energies, Ed, along the direction parallel to the basal planes are smaller than those perpendicular to the basal planes. The minimum Ed values are determined to be 19 eV and 55 eV for N and Al atom, respectively, which occur along the [1¯1¯20] direction. In general, the threshold displacement energies for N are smaller than those for Al atom, indicating the N defects would be dominant under irradiation. The defect production mechanisms have been analyzed. It is found that charge transfer and redistribution for both the primary knock-on atom and the subsequent recoil atoms play a significant role in defect production and evolution. Similar to the trend in oxide materials, there is a nearly linear relationship between Ed and the total amount of charge transfer at the potential energy peak in AlN, which provides guidance on the development of charge-transfer interatomic potentials for classic molecular dynamics simulations. Finally, the response behavior of AlN to low energy irradiation is qualitatively investigated. The existence of irradiation-induced defects significantly modifies the electronic structure, and thus affects the magnetic, electronic and optical properties of AlN. These findings further enrich the understanding of defects in the wide bandgap semiconductor of AlN.

ACS Style

Jianqi Xi; Bin Liu; Yanwen Zhang; William J. Weber. Ab initio molecular dynamics simulations of AlN responding to low energy particle radiation. Journal of Applied Physics 2018, 123, 045904 .

AMA Style

Jianqi Xi, Bin Liu, Yanwen Zhang, William J. Weber. Ab initio molecular dynamics simulations of AlN responding to low energy particle radiation. Journal of Applied Physics. 2018; 123 (4):045904.

Chicago/Turabian Style

Jianqi Xi; Bin Liu; Yanwen Zhang; William J. Weber. 2018. "Ab initio molecular dynamics simulations of AlN responding to low energy particle radiation." Journal of Applied Physics 123, no. 4: 045904.

Journal article
Published: 01 October 2017 in Scripta Materialia
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ACS Style

Jianqi Xi; Bin Liu; Fenglin Yuan; Yanwen Zhang; William J. Weber. Diffusion of point defects near stacking faults in 3C-SiC via first-principles calculations. Scripta Materialia 2017, 139, 1 -4.

AMA Style

Jianqi Xi, Bin Liu, Fenglin Yuan, Yanwen Zhang, William J. Weber. Diffusion of point defects near stacking faults in 3C-SiC via first-principles calculations. Scripta Materialia. 2017; 139 ():1-4.

Chicago/Turabian Style

Jianqi Xi; Bin Liu; Fenglin Yuan; Yanwen Zhang; William J. Weber. 2017. "Diffusion of point defects near stacking faults in 3C-SiC via first-principles calculations." Scripta Materialia 139, no. : 1-4.

Journals
Published: 07 February 2017 in Physical Chemistry Chemical Physics
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Site preferences occur under epitaxial strain, resulting in orders of magnitude differences in vacancy concentrations on different oxygen sites.

ACS Style

Jianqi Xi; Haixuan Xu; Yanwen Zhang; William J. Weber. Strain effects on oxygen vacancy energetics in KTaO3. Physical Chemistry Chemical Physics 2017, 19, 6264 -6273.

AMA Style

Jianqi Xi, Haixuan Xu, Yanwen Zhang, William J. Weber. Strain effects on oxygen vacancy energetics in KTaO3. Physical Chemistry Chemical Physics. 2017; 19 (8):6264-6273.

Chicago/Turabian Style

Jianqi Xi; Haixuan Xu; Yanwen Zhang; William J. Weber. 2017. "Strain effects on oxygen vacancy energetics in KTaO3." Physical Chemistry Chemical Physics 19, no. 8: 6264-6273.

Journal article
Published: 01 October 2016 in Computational Materials Science
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ACS Style

Jianqi Xi; Bin Liu; Yanwen Zhang; William J. Weber. Ab initio study of point defects near stacking faults in 3C-SiC. Computational Materials Science 2016, 123, 131 -138.

AMA Style

Jianqi Xi, Bin Liu, Yanwen Zhang, William J. Weber. Ab initio study of point defects near stacking faults in 3C-SiC. Computational Materials Science. 2016; 123 ():131-138.

Chicago/Turabian Style

Jianqi Xi; Bin Liu; Yanwen Zhang; William J. Weber. 2016. "Ab initio study of point defects near stacking faults in 3C-SiC." Computational Materials Science 123, no. : 131-138.

Journal article
Published: 01 August 2015 in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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ACS Style

Jianqi Xi; Peng Zhang; Chaohui He; Hang Zang; Daxi Guo; Tao Li. The role of point defects in the swelling and elastic modulus of irradiated cubic silicon carbide. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 2015, 356-357, 62 -68.

AMA Style

Jianqi Xi, Peng Zhang, Chaohui He, Hang Zang, Daxi Guo, Tao Li. The role of point defects in the swelling and elastic modulus of irradiated cubic silicon carbide. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2015; 356-357 ():62-68.

Chicago/Turabian Style

Jianqi Xi; Peng Zhang; Chaohui He; Hang Zang; Daxi Guo; Tao Li. 2015. "The role of point defects in the swelling and elastic modulus of irradiated cubic silicon carbide." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 356-357, no. : 62-68.

Journal article
Published: 01 December 2014 in Journal of Nuclear Materials
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ACS Style

Daxi Guo; Hang Zang; Peng Zhang; Jianqi Xi; Tao Li; Li Ma; Chaohui He. Analysis of primary damage in silicon carbide under fusion and fission neutron spectra. Journal of Nuclear Materials 2014, 455, 229 -233.

AMA Style

Daxi Guo, Hang Zang, Peng Zhang, Jianqi Xi, Tao Li, Li Ma, Chaohui He. Analysis of primary damage in silicon carbide under fusion and fission neutron spectra. Journal of Nuclear Materials. 2014; 455 (1-3):229-233.

Chicago/Turabian Style

Daxi Guo; Hang Zang; Peng Zhang; Jianqi Xi; Tao Li; Li Ma; Chaohui He. 2014. "Analysis of primary damage in silicon carbide under fusion and fission neutron spectra." Journal of Nuclear Materials 455, no. 1-3: 229-233.

Journal article
Published: 06 September 2013 in International Journal of Applied Ceramic Technology
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ACS Style

Tao Yang; Hang Zang; Chaohui He; Daxi Guo; Peng Zhang; Jianqi Xi; Li Ma; Zhiguang Wang; Tielong Shen; Lilong Pang; Cunfeng Yao. Evaluation of Mechanical Properties Variations for Kr Ion-Irradiated 6H-SiC by Nanoindentation Methods. International Journal of Applied Ceramic Technology 2013, 12, 390 -398.

AMA Style

Tao Yang, Hang Zang, Chaohui He, Daxi Guo, Peng Zhang, Jianqi Xi, Li Ma, Zhiguang Wang, Tielong Shen, Lilong Pang, Cunfeng Yao. Evaluation of Mechanical Properties Variations for Kr Ion-Irradiated 6H-SiC by Nanoindentation Methods. International Journal of Applied Ceramic Technology. 2013; 12 (2):390-398.

Chicago/Turabian Style

Tao Yang; Hang Zang; Chaohui He; Daxi Guo; Peng Zhang; Jianqi Xi; Li Ma; Zhiguang Wang; Tielong Shen; Lilong Pang; Cunfeng Yao. 2013. "Evaluation of Mechanical Properties Variations for Kr Ion-Irradiated 6H-SiC by Nanoindentation Methods." International Journal of Applied Ceramic Technology 12, no. 2: 390-398.

Journal article
Published: 01 April 2013 in Journal of Nuclear Materials
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ACS Style

Jianqi Xi; Chaohui He; Hang Zang; Daxi Guo; Tao Yang; Tao Bo; Peng Zhang. Evolution of atoms with special coordination number in β-SiC with temperature. Journal of Nuclear Materials 2013, 435, 236 -240.

AMA Style

Jianqi Xi, Chaohui He, Hang Zang, Daxi Guo, Tao Yang, Tao Bo, Peng Zhang. Evolution of atoms with special coordination number in β-SiC with temperature. Journal of Nuclear Materials. 2013; 435 (1):236-240.

Chicago/Turabian Style

Jianqi Xi; Chaohui He; Hang Zang; Daxi Guo; Tao Yang; Tao Bo; Peng Zhang. 2013. "Evolution of atoms with special coordination number in β-SiC with temperature." Journal of Nuclear Materials 435, no. 1: 236-240.

Journal article
Published: 18 January 2013 in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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4 MeV Kr-ions were irradiated into 6H–SiC single crystals with fluences from 1.0 × 1016 to 5.0 × 1016 cm−2 at room temperature, 300 °C and 500 °C, respectively (5.0 × 1016 cm−2 at 550 °C). The irradiation-induced modifications were measured by Atomic Force Microscope (AFM), Raman Spectrometer and Nano-indentation measurements. It was observed that the surface of RT-irradiated samples became rough as a result of crystallizing to amorphous state. The result of Raman spectra indicates that different migration behaviors of Si and C interstitials at different temperatures could have an effect on the stoichiometry of irradiated samples. It was also observed that the hardness of irradiated samples is higher than that of un-irradiated ones at high temperatures, with increase at low fluence and then decrease at high fluence. Finally, the effects of irradiation temperature and ion fluence are discussed.

ACS Style

Hang Zang; Tao Yang; Daxi Guo; Jianqi Xi; Chaohui He; Zhiguang Wang; Tielong Shen; Lilong Pang; Cunfeng Yao; Peng Zhang. Modifications of SiC under high fluence Kr-ion irradiation at different temperatures. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 2013, 307, 558 -561.

AMA Style

Hang Zang, Tao Yang, Daxi Guo, Jianqi Xi, Chaohui He, Zhiguang Wang, Tielong Shen, Lilong Pang, Cunfeng Yao, Peng Zhang. Modifications of SiC under high fluence Kr-ion irradiation at different temperatures. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2013; 307 ():558-561.

Chicago/Turabian Style

Hang Zang; Tao Yang; Daxi Guo; Jianqi Xi; Chaohui He; Zhiguang Wang; Tielong Shen; Lilong Pang; Cunfeng Yao; Peng Zhang. 2013. "Modifications of SiC under high fluence Kr-ion irradiation at different temperatures." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 307, no. : 558-561.