J4 ›› 2010, Vol. 48 ›› Issue (05): 847-850.

• 化学 • 上一篇    下一篇

高压下Ge的结构转变及弹性性质的第一性原理计算

赵瑞1, 李雪飞2, 张剑2   

  1. 1. 吉林师范大学 计算机学院, 吉林 四平 136000|2. 吉林大学 超硬材料国家重点实验室, 长春 130012
  • 收稿日期:2010-06-27 出版日期:2010-09-26 发布日期:2010-09-21
  • 通讯作者: 张剑 E-mail:zhangjian_lxf@yahoo.com.cn

First-Principles Investigations on Structural Transformation and Elastic Properties of Ge under High Pressure

ZHAO Rui1, LI Xue fei2, ZHANG Jian2   

  1. 1. College of Computer, Jilin Normal University, Siping 136000, Jilin Province, China|2. State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China
  • Received:2010-06-27 Online:2010-09-26 Published:2010-09-21
  • Contact: ZHANG Jian E-mail:zhangjian_lxf@yahoo.com.cn

摘要:

利用基于密度泛函理论的第一性原理方法, 计算在压力作用下Ge的结构转变、 能带结构、 电子态密度和弹性性质. 结果表明: 在9.0 GPa压力点, Ge发生了从立方金刚石结构(Ge-Ⅰ)到β-Sn结构(Ge-Ⅱ)的一级结构相变;  材料的导电性能由半导体转变为导体;  Ge-Ⅰ的弹性常数随压力线性增加. 

关键词: 第一性原理计算, 结构相变, 高压, 弹性性质

Abstract:

 An investigation on structural transformation, electronic and elastic properties of Ge under high pressure was conducted via first\|principles calculations based on density functional theory (DFT) with the plane wave basis set. The results show that  first\|order structural transformation from the cubic diamond (Ge-Ⅰ) to β-Sn structure (Ge-Ⅱ) occurs at 9.0 GPa. The electric conductivity of material was  transformed, that is,  from that of  semiconductor to that of conductor. The  elastic coefficient of Ge-Ⅰ shows a linear relation with  pressure. 

Key words: first-principles calculations, structural transformation, high pressure, elastic properties

中图分类号: 

  • TB303