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.
Yang, X. D.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yang, Z. J.;Tang, L.;Guo, A. M.;Cheng, X. L.;Zhu, Z. H.;Yang, X. D.

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用第一性原理研究了纳米叠层Zr 2 InC的弹性和结构性质,结果表明,在70 ~ 400 GPa范围内,对于任何模式,包括广义梯度近似(GGA)和局域密度近似,沿c轴沿着方向都存在超不可压缩性.这种反常行为是由核价电荷转移的减慢引起的。Zr原子沿着c轴的快速位移也对超不可压缩性有很大贡献,因为当Zr原子沿c轴的位移在400 GPa以上时沿着c轴的位移暂停,超不可压缩性大大降低。弹性常数和声子振动频率的研究同时证实了结构不稳定。泊松比的调查观察到更高的离子或更弱的共价键在原子间键合的贡献和电离度随压力的增加。
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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