吉林大学学报(理学版)

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SrCl2晶体高压结构转变的第一性原理计算

杨晓翠1, 张成1, 崔晓娟1, 宋雪婷1, 田丹2, 王静1, 张玉双1   

  1. 1. 白城师范学院 物理学院, 吉林 白城 137000; 2. 吉林大学 超硬材料国家重点实验室, 长春 130012
  • 收稿日期:2013-09-23 出版日期:2014-03-26 发布日期:2014-03-20
  • 通讯作者: 杨晓翠 E-mail:yxc0622@163.com

FirstPrinciple Investigation of  PressureInducedStructural Transition of SrCl2

YANG Xiaocui1, ZHANG Cheng1, CUI Xiaojuan1, SONG Xueting1,TIAN Dan2, WANG Jing1, ZHANG Yushuang1   

  1. 1. College of Physics, Baicheng Normal University, Baicheng 137000, Jilin Province, China;2. State Key Laboratory of  Superhard Materials, Jilin University, Changchun 130012, China
  • Received:2013-09-23 Online:2014-03-26 Published:2014-03-20
  • Contact: YANG Xiaocui E-mail:yxc0622@163.com

摘要:

利用基于密度泛函的第一性原理, 计算SrCl2压致结构转变的压力. 结果表明: SrCl2在2.1 GPa处发生第一个压致结构转变, 由萤石结构(空间群Fm3m)转变为正交结构(空间群Pnma); 在65.7 GPa处发生第二个压致结构转变, 由正交结构转变为六角结构(空间群P63/mmc); 两个压致结构转变均发生体积突变, 分别为4.7%和0.2%, 均属于一级相变.

关键词: 第一性原理计算, 压致结构转变, 弹性系数, 高压

Abstract:

We presented a detailed investigation of the pressureinduced phase transition of SrCl2 using the firstprinciple calculation based on
density functional theory (DFT). Our results show that the sequence of the pressureinduced structural transitions of SrCl2 was from fluorite structure (Fm3m) to orthorhombic structure (Pnma), then to the hexagonal structure (P63/mmc). Two structural transitions,  all firstorder phase transitions, occurred at pressure of 2.1 GPa and 65.7 GPa, with volume collapses of 4.7% and 0.2%, respectively.

Key words: firstprinciple calculation, pressureinduced structural transition, elastic constant, high pressure

中图分类号: 

  • O521.23