吉林大学学报(理学版)

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压力下超导LiBe合金热动力学性质的第一原理计算

王兴1, 濮春英2, 靳希联3   

  1. 1. 南阳师范学院 软件学院, 河南 南阳 473061; 2. 南阳师范学院 物理与电子工程学院, 河南 南阳 473061;3. 吉林大学 物理学院超硬材料国家重点实验室,
    长春 130012
  • 收稿日期:2014-02-25 出版日期:2014-07-26 发布日期:2014-09-26
  • 通讯作者: 濮春英 E-mail:puchunying@126.com

FirstPrinciple Calculations of Thermal Dynamical Propertiesof Superconducting LiBe Alloy under Pressure

WANG Xing1, PU Chunying2, JIN Xilian3   

  1. 1. College of Software, Nanyang Normal University, Nanyang 473061,Henan Province, China; 2. College ofPhysics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, Henan Province, China;3. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • Received:2014-02-25 Online:2014-07-26 Published:2014-09-26
  • Contact: PU Chunying E-mail:puchunying@126.com

摘要:

采用基于密度泛函理论的第一性原理方法研究超导LiBe合金的晶体结构、 力学、 热动力学和电子结构等性质. 结果表明: LiBe合金在0~120 GPa内均满足力学稳定标准; 在压力下呈一定的各向异性, 且c轴比a轴更易于压缩; 随着压力的增加, 其Debye温度不断增加; 在压力作用下, LiBe合金中Li的s电子向Be的p电子转移.

关键词: 超导合金, 热动力学, 高压

Abstract:

The crystal structure, mechanical, thermodynamic, and electronic properties of the B19 phase of superconducting alloy LiBe were investigated by means of firstprinciple method based on the density functional theory. The results show that the elastic constants of LiBe alloy meet the BonnHuang kun criterion up to 120 GPa, and thus its lattice is dynamics stable. With increasing pressure, LiBe alloy exhibits anisotropy to some degree, and axis c is more compressible than axis a. The Debye temperature of LiBe alloy increases with increasing pressure. The populations analysis shows that the electron mainly transfers from s electron of Li atom to p electron of Be atom in LiBe alloy under pressure.

Key words: superconducting alloy, thermal dynamics, high pressure

中图分类号: 

  • O521.2