Origin of c-axis ultraincompressibility of Zr2InC above 70 GPa via first-principles
Origin of c-axis ultraincompressibility of Zr2InC above 70 GPa via first-principles
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通过第一原理得出 70 GPa 以上 Zr2InC c 轴超不可压缩性的起源
DOI:
10.1063/1.4819174
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发表时间:
2013-08
影响因子:
3.2
通讯作者:
Yang, X. D.
中科院分区:
文献类型:
--
作者:
Yang, Z. J.;Tang, L.;Guo, A. M.;Cheng, X. L.;Zhu, Z. H.;Yang, X. D.
The elastic and structural properties of nanolaminate Zr2InC are studied by first-principles, and it is shown that, for any used modes, including the generalized gradient approximation (GGA) and localized density approximation, there always exists an ultraincompressibility along c axis between 70 GPa and 400 GPa. Such anomalous behavior is originated from the slowdown of core-valence charge transfer. The rapid shift of Zr atom along c axis also contributed much to the ultraincompressibility as it is greatly reduced once the Zr atom shift suspends along c axis above about 400 GPa. Both the elastic constants and the phononic vibrational frequencies investigations confirmed the structural unstable simultaneously. The Poisson's ratio investigations observed a higher ionic or weaker covalent contribution in interatomic bonding and the degree of ionicity increases with pressure.
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