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Stability and mechanical properties of various Hf-H phases:A density-functional theory study |
Wei Xiao(肖伟)1,2, Lu Sun(孙璐)1, Shu-Hui Huang(黄树晖)1, Jian-Wei Wang(王建伟)1, Lei Cheng(程磊)1, Li-Gen Wang(王立根)1 |
1. General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. University of Science and Technology Beijing, Beijing 100083, China |
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Abstract We performe first-principles density functional theory calculations to investigate the stability and mechanical properties of various HfHx (0 ≤ x ≤ 1) phases. For pure Hf phases, the calculated results show that the HCP and FCC phases are mechanically stable, while the BCC phase is unstable at 0 K. Also, as for various HfHx phases, we find that H location and concentration could have a significant effect on their stability and mechanical properties. When 0 ≤ x ≤ 0.25, the HCP phases with H at (tetrahedral) T sites are energetically most stable among various phases. The FCC and BCC phases with H at T sites turn to be relatively more favorable than the HCP phase when H concentration is higher than 0.25. Furthermore, our calculated results indicate that the H solution in Hf can largely affect their mechanical properties such as the bulk moduli (B) and shear moduli (G).
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Received: 10 May 2017
Revised: 10 July 2017
Accepted manuscript online:
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PACS:
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61.82.Bg
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(Metals and alloys)
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62.20.-x
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(Mechanical properties of solids)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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71.15.Nc
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(Total energy and cohesive energy calculations)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51401030 and 51504033). |
Corresponding Authors:
Li-Gen Wang
E-mail: lg_wang1@yahoo.com
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Cite this article:
Wei Xiao(肖伟), Lu Sun(孙璐), Shu-Hui Huang(黄树晖), Jian-Wei Wang(王建伟), Lei Cheng(程磊), Li-Gen Wang(王立根) Stability and mechanical properties of various Hf-H phases:A density-functional theory study 2017 Chin. Phys. B 26 106103
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