计算物理 ›› 1992, Vol. 9 ›› Issue (3): 223-231.

• 论文 •    下一篇

LMTO-ASA-VCA计算方法和(Ba1-xKx)BiO3的电子结构

沈耀文, 王仁智, 黄美纯   

  1. 厦门大学物理系, 厦门 361005
  • 收稿日期:1990-07-29 修回日期:1992-04-02 出版日期:1992-09-25 发布日期:1992-09-25

LMTO-ASA-VCA METHOD AND ELECTRONIC STRUCTURE OF (Ba1-xKx)BiO3 SYSTEM

Shen Yaowen, Wang Renzhi, Huang Meichun   

  1. Dept. of Physics, Xiamen University, Fujian, 361005
  • Received:1990-07-29 Revised:1992-04-02 Online:1992-09-25 Published:1992-09-25

摘要: 本文在LMTO-ASA Linear Muffin-Tin Orbital method-Atomic Sphere Approximations)方法计算能带结构的基础上,讨论了用原子球半径及相应的势参数线性内插的虚晶近似(VCA)方法,计算混晶材料的电子结构。以(Ba1-xKx)BiO3为例,对比用VCA方法计算的结果与用扩大原胞法对特定组分x的自洽计算结果,说明了VCA方法基本假设的可靠性,计算参数的设置要求和计算结果的精度。

关键词: (Ba1-xKx)BiO3, 电子结构, 超元胞法

Abstract: On the basis of LMTO-ASA band calculation method, the electronic structure of (Ba1-xKx)BiO3 system was obtained by using a virtual crystal approximation (VCA) in which the atomic sphere radii and potential parameters in different compositions are determined by linear interpolation. We contrast the composition dependence of the VCA electronic structure with those of the expended unit cell method. It is shown that the VCA method was valid for such a complex system. The accuracy of our LMTO-ASA-VCA results is also discussed.

Key words: (Ba1-xKx)BiO3, electronic structure