| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Effect of structural vacancies on lattice vibration, mechanical, electronic, and thermodynamic properties of Cr5BSi3 |
| Tian-Hui Dong(董天慧)1, Xu-Dong Zhang(张旭东)1,†, Lin-Mei Yang(杨林梅)1, and Feng Wang(王峰)2 |
1 School of Science, Shenyang University of Technology, Shenyang 110870, China;
2 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China |
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Abstract In recent years, transition metal silicides have become the potential high temperature materials. The ternary silicide has attracted the attention of scientists and researchers. But their inherent brittle behaviors hinder their wide applications. In this work, we use the first-principles method to design four vacancy defects and discuss the effects of vacancy defects on the structural stability, mechanical properties, electronic and thermodynamic properties of hexagonal Cr5BSi3 silicide. The data of lattice vibration and thermodynamic parameters indicate that the Cr5BSi3 with different atomic vacancies can possess the structural stabilities. The different atomic vacancies change the mechanical properties and induce the Cr5BSi3 to implement the brittle-to-ductile transition. The shear deformation resistance and volume deformation resistance of Cr5BSi3 are weakened by different vacancy defects. But the brittleness behavior is remarkably improved. The structural stability and brittle-to-ductile transition of Cr5BSi3 with different vacancies are explored by the electronic structures. Moreover, the thermal parameters indicate that the Cr5BSi3 with vacancies exhibit different thermodynamic properties with temperature rising.
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Received: 13 May 2021
Revised: 30 June 2021
Accepted manuscript online: 07 July 2021
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PACS:
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61.43.Bn
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(Structural modeling: serial-addition models, computer simulation)
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61.72.Bb
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(Theories and models of crystal defects)
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61.72.jd
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(Vacancies)
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62.20.-x
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(Mechanical properties of solids)
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| Fund: Project supported by the Natural Science Foundation of Liaoning Province, China (Grant No. 2019JH/30100019). |
Corresponding Authors:
Xu-Dong Zhang
E-mail: zxdwfc@163.com
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Cite this article:
Tian-Hui Dong(董天慧), Xu-Dong Zhang(张旭东), Lin-Mei Yang(杨林梅), and Feng Wang(王峰) Effect of structural vacancies on lattice vibration, mechanical, electronic, and thermodynamic properties of Cr5BSi3 2022 Chin. Phys. B 31 026101
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