计算物理 ›› 2000, Vol. 17 ›› Issue (S1): 6-10.DOI: 10.3969/j.issn.1001-246X.2000.01.003

• 论文 • 上一篇    下一篇

稀土-铱-锑合金热电材料的结构与量子化学计算研究

闵新民, 安继明, 南策文   

  1. 武汉工业大学材料复合新技术国家重点实验室, 湖北 武汉 430070
  • 收稿日期:1999-07-12 修回日期:1999-10-21 出版日期:2000-12-25 发布日期:2000-12-25
  • 作者简介:闶新民(1955~),男,湖北,教授,博士,主要从事计算材料科学的研究
  • 基金资助:
    国家杰出青年基金资助项目(59825102);湖北省自然科学基金资助项目(98J028)

QUANTUM CHEMISTRY STUDY ON STRUCTURAL CHARACTERISTICS OF THERMOELECTRICS OF RARE EARTH-Ir-Sb ALLOYS

MIN Xin-min, AN Ji-ming, NAN Ce-wen   

  1. National Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P R China
  • Received:1999-07-12 Revised:1999-10-21 Online:2000-12-25 Published:2000-12-25

摘要: 应用离散变分Xα量子化学计算方法,研究了IrSb3,Ir4NdGe3Sb9和Ir4SmGe3Sb9三个skutterudites的组成、结构、化学键和热电性能之间的关系。对Ir4NdGe3Sb9和Ir4SmGe3Sb9,用多个模型研究了稀土元素振动的结构。计算结果表明,稀土原子靠近Ge原子的模型比靠近Sb原子的模型更为稳定,热导率也较低。Ir4NdGe3Sb9的共价键比Ir4SmGe3Sb9弱,Ir4NdGe3Sb9和Ir4SmGe3Sb9的共价键又比IrSb3弱,与热导率的实验测量结果一致。

关键词: skutterudite, 热电材料, 结构与性能, 量子化学计算

Abstract: The correlation among composition, structure, chemical bond and thermoelectric property of skutterudites of IrSb3, Ir4NdGe3Sb9 and Ir4SmGe3Sb9 is studied using SCF-DV-Xα method, one of calculation methods in quantum chemistry. Ir4NdGe3Sb9 and Ir4SmGe3Sb9 are calculated with several models for investigating the "rattling" patterns. The results show that the model with rare earth near to Ge is more stable than that with rare earth near to Sb, and the former is with lower thermal conductivity. The covalent bonds of Ir4SmNdGe3Sb9 are weaker than those of Ir4SmGe3Sb9, and those of Ir4NdGe3Sb9 and Ir4SmGe3Sb9 are both weaker than those of IrSb3, which is consistent with the experimental result of thermal conductivity.

Key words: skutterudite, thermoelectrics, structure and property, quantum chemistry calculation

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