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Effect of carbon vacancies on structural and mechanical properties of stable zirconium carbides: A first principles study

By using evolutionary algorithm USPEX, we have predicted a number of stable zirconium carbides. In addition to the well-known rocksalt-type stoichiometric ZrC (Fm-3m), present prediction also identifies five stable substoichiometric zirconium carbides adopting rocksalt-type structures with ordered carbon vacancies, Zr8C7 (P-1), Zr6C5 (C2/m), Zr5C4 (P-1), Zr3C2 (C2/m), and Zr2C (Fd-3m). The effects of carbon vacancies on structural and mechanical properties are investigated. We highlight that the distribution of carbon vacancies has significant influence on volume, Pugh's ratio, and hardness. We further propose that hardness can be enhanced by replacing carbon vacancies with suitable elements, in particular nitrogen and oxygen.

preprint2015arXivOpen access
Congwei XieArtem R. OganovDuan LiTekalign Terfa DebelaNing LiuDong DongQingfeng Zeng
cond-mat.mtrl-sci
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Open access7 authors1 topic
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Congwei XieArtem R. OganovDuan LiTekalign Terfa DebelaNing LiuDong DongQingfeng Zeng

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