吉林大学学报(理学版)

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Li3S和Li2S高压结构与超导电性的第一性原理计算

陈洪斌   

  1. 吉林医药学院 生物医学工程学院, 吉林 吉林 132013
  • 收稿日期:2015-09-08 出版日期:2016-03-26 发布日期:2016-03-23
  • 通讯作者: 陈洪斌 E-mail:15143215955@163.com

First Principles Calculation of High Pressure Structureand Superconductivity of Li3S and Li2S

CHEN Hongbin   

  1. College of Biomedical Engineering, Jilin Medical University, Jilin 132013, Jilin Province, China
  • Received:2015-09-08 Online:2016-03-26 Published:2016-03-23
  • Contact: CHEN Hongbin E-mail:15143215955@163.com

摘要:

采用第一性原理方法研究Li3S和Li2S在0~50 GPa下的晶体结构、 电子性质与超导电性. 结果表明: 当压力高于16 GPa时, Li3S由Li2S和Li单质合成, 其高压相变序列为P63/m→P63/mmc→Pm-3m; Li3S呈金属性, 但其电声相互作用较弱, 不是超导体; 预测的Li2S的高压相变序列与已有结果相符, 在50 GPa下的Li2S仍未实现金属化.

关键词: 金属硫化物, 高压, 超导电性, 第一性原理

Abstract:

Using the first principles method, the author studied the crystal structure, electronic properties and superconductivity of Li3S and Li2S at 0—50 GPa. The results show that Li3S can be synthesized at pressure above 16 GPa from Li2S+Li, and the high pressure phase transition sequence of Li3S is
 P63/m→P63/mmc→Pm-3m. Li3S is metallic, but the electronphonon interaction in Li3S is very weak indicating Li3S is not a superconductor. The predicted high pressure phase transition sequence of Li2S is in agreement with the existing results. Li2S is still not metallization at 50 GPa.

Key words: metal chalcogenides, high pressure, superconductivity, first principle

中图分类号: 

  • O521.1