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Li M, Hu J, Gong H, Ren Q, Liao Y, Xiao H, Qiu Q, Feng S, Zu X. First-principles study of point defects in U 3Si 2: effects on the mechanical and electronic properties. Phys Chem Chem Phys 2022; 24:4287-4297. [PMID: 35107460 DOI: 10.1039/d1cp04745k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent years, U3Si2 has been proposed as an alternative nuclear fuel material to uranium dioxide (UO2) because of its intrinsically high uranium density and thermal conductivity. However, the operation environment in the nuclear reactor is complex and extreme, such as in-pile neutron irradiation, and thus it is necessary to explore the radiation response behavior of U3Si2 and the physical properties of its damaged states. In the present study, first-principles calculations based on density functional theory were carried out to investigate the mechanical and electronic properties of defective U3Si2. Our results showed that the defect stability in U3Si2, except its interstitial defects, is dependent on its chemical environment. When vacancy, antisite or interstitial defects are introduced into U3Si2, its elastic modulus are decreased and its ductility is enhanced. Although the presence of defects in U3Si2 does not change its metallic nature and the electron distribution in its Fermi level, their effect on the partial chemical bonding interaction is significant. This study suggests that under a radiation environment, the created defects in U3Si2 remarkably affect its mechanical and electronic properties.
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Affiliation(s)
- Menglu Li
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Jutao Hu
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Hengfeng Gong
- Department of ATF R & D, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, 518000, China. .,High-safety ATF Engineering Laboratory of Shenzhen, Shenzhen, 518116, China
| | - Qisen Ren
- Department of ATF R & D, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, 518000, China.
| | - Yehong Liao
- Department of ATF R & D, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, 518000, China.
| | - Haiyan Xiao
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Qihang Qiu
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Shan Feng
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Xiaotao Zu
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
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Paul R, Hu SX, Karasiev VV. Anharmonic and Anomalous Trends in the High-Pressure Phase Diagram of Silicon. PHYSICAL REVIEW LETTERS 2019; 122:125701. [PMID: 30978067 DOI: 10.1103/physrevlett.122.125701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Indexed: 06/09/2023]
Abstract
A multifaceted first-principles approach utilizing density functional theory, evolutionary algorithms, and lattice dynamics was used to construct the phase diagram of silicon up to 4 TPa and 26 000 K. These calculations predicted that (i) an anomalous sequence of face-centered cubic to body-centered cubic to simple cubic crystalline phase transitions occur at pressures of 2.87 and 3.89 TPa, respectively, along the cold curve, (ii) the orthorhombic phases of Imma and Cmce-16 appear on the phase diagram only when the anharmonic contribution to the Gibbs free energy is taken into account, and (iii) a substantial change in the slope of the principal Hugoniot is observed if the anharmonic free energy of the cubic diamond phase is considered.
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Affiliation(s)
- R Paul
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - S X Hu
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - V V Karasiev
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
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3
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Phase transformations in materials studied by micro-Raman spectroscopy of indentations. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s100190050011] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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He C, Zhang C, Li J, Peng X, Meng L, Tang C, Zhong J. Direct and quasi-direct band gap silicon allotropes with remarkable stability. Phys Chem Chem Phys 2016; 18:9682-6. [DOI: 10.1039/c6cp00451b] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Promising low energy direct or quasi-direct band gap semiconductors for solar cell application.
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Affiliation(s)
- Chaoyu He
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Chunxiao Zhang
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Jin Li
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Xiangyang Peng
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Lijun Meng
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Chao Tang
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
| | - Jianxin Zhong
- School of Physics and Optoelectronics
- Xiangtan University
- Xiangtan 411105
- China
- Hunan Key Laboratory for Micro-Nano Energy Materials and Devices
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Zhao HY, Wang J, Ma QM, Liu Y. sp3-Bonded silicon allotropes based on the Kelvin problem. Phys Chem Chem Phys 2013; 15:17619-25. [DOI: 10.1039/c3cp50946j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhao Z, Tian F, Dong X, Li Q, Wang Q, Wang H, Zhong X, Xu B, Yu D, He J, Wang HT, Ma Y, Tian Y. Tetragonal Allotrope of Group 14 Elements. J Am Chem Soc 2012; 134:12362-5. [DOI: 10.1021/ja304380p] [Citation(s) in RCA: 159] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhisheng Zhao
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Fei Tian
- School of
Physics and MOE Key
Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
| | - Xiao Dong
- School of
Physics and MOE Key
Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
| | - Quan Li
- State Key Laboratory of Superhard
Materials, Jilin University, Changchun
130012, China
| | - Qianqian Wang
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Hui Wang
- State Key Laboratory of Superhard
Materials, Jilin University, Changchun
130012, China
| | - Xin Zhong
- State Key Laboratory of Superhard
Materials, Jilin University, Changchun
130012, China
| | - Bo Xu
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Dongli Yu
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Julong He
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Hui-Tian Wang
- School of
Physics and MOE Key
Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
| | - Yanming Ma
- State Key Laboratory of Superhard
Materials, Jilin University, Changchun
130012, China
| | - Yongjun Tian
- State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
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Qiu SL, Marcus PM. Equilibrium lines and barriers to phase transitions: the cubic diamond to beta-tin transition in Si from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:225501. [PMID: 22551557 DOI: 10.1088/0953-8984/24/22/225501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The phase transition between the cubic diamond (cd) and beta-tin (β-Sn) phases of Si under pressure and the region of interaction of the two phases are studied by first-principles total energy calculations. For a non-vibrating crystal we determine the pressure of the thermodynamic phase transition p(t) = 96 kbar, the Gibbs free energy barrier at p(t) of ΔG = 19.6 mRyd/atom that stabilizes the phases against a phase transition and the finite pressure range in which both phases are stable. We show that the phases in that pressure range are completely described by three equilibrium lines of states along which the structure, the total energy E, the hydrostatic pressure p that would stabilize the structure and the values of G all vary. Two equilibrium lines describe the two phases (denoted the ph-eq line, ph is cd or β-Sn phase); a third line is a line of saddle points of G with respect to structure (denoted the sp-eq line) that forms a barrier of larger G against instability of the metastable ranges of the phase lines. An important conclusion is that the sp-eq line merges with the two ph-eq lines: one end of the sp-eq line merges with the cd-eq line at high pressure, the other end merges with the β-Sn-eq line at low pressure. The mergers end the barrier protecting the metastable ranges of the two ph-eq lines, hence the lines go unstable beyond the mergers. The mergers thus simplify the phase diagram by providing a natural termination to the stable parts of all metastable ranges of the ph-eq lines. Although 96 kbar is lower than the experimental transition pressure, we note that phonon pressure raises the observed transition pressure.
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Affiliation(s)
- S L Qiu
- Department of Physics, Florida Atlantic University, Boca Raton, FL 33431-0991, USA.
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Kaczmarski M, Bedoya-Martínez ON, Hernández ER. Phase diagram of silicon from atomistic simulations. PHYSICAL REVIEW LETTERS 2005; 94:095701. [PMID: 15783976 DOI: 10.1103/physrevlett.94.095701] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2004] [Indexed: 05/24/2023]
Abstract
In this Letter we present a calculation of the temperature-pressure phase diagram of Si in a range of pressures covering from -5 to 20 GPa and temperatures up to the melting point. The phase boundaries and triple points between the diamond, liquid, beta-Sn, and Si34 clathrate phases are reported. We have employed efficient simulation techniques to calculate free energies and to numerically integrate the Clausius-Clapeyron equation, combined with a tight-binding model capable of an accuracy comparable to that of first-principles methods. The resulting phase diagram agrees well with the available experimental data.
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Affiliation(s)
- M Kaczmarski
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de Bellaterra, 08193 Barcelona, Spain
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Yoshizawa K, Kato T, Tachibana M, Yamabe T. Vibronic Interactions in Silicon Polyhedra of the Si46 Clathrate Compound. J Phys Chem A 1998. [DOI: 10.1021/jp982113z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazunari Yoshizawa
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takashi Kato
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masamitsu Tachibana
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Tokio Yamabe
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan, and Institute for Fundamental Chemistry, 34-4 Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
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Mujica A, Needs RJ, Muñoz A. First-principles pseudopotential study of the phase stability of the III-V semiconductors GaAs and AlAs. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:8881-8892. [PMID: 9979878 DOI: 10.1103/physrevb.52.8881] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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11
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Moll N, Bockstedte M, Fuchs M, Pehlke E, Scheffler M. Application of generalized gradient approximations: The diamond- beta -tin phase transition in Si and Ge. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:2550-2556. [PMID: 9981322 DOI: 10.1103/physrevb.52.2550] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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