Inherent instability by antibonding coupling in AgSbTe2

Hikari Shinya, Akira Masago, Tetsuya Fukushima, Hiroshi Katayama-Yoshida

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the present paper, an inherent instability in the ternary chalcogenide compound AgSbTe2 is described from the electronic structure viewpoint. Our calculations, which are based on the cluster expansion method, suggest nine stable crystal structures involving the most stable structure with Fd3m symmetry. The effective pair interactions calculated by the generalized perturbation method point out that the stability of these structures originates from the number of linear arrangements of the Ag-Te-Sb atomic bonds. Moreover, it is found that AgSbTe2 has a special electronic structure, where the dominant components of the top of the valence band are the Te-5p antibonding states. Such an antibonding contribution leads to an inherent instability, such that the system spontaneously forms various mutation phases caused by charge-compensated defect complexes. We propose that these mutation phases play an important role in the thermal conductivity and thermoelectric efficiency in AgSbTe2.

Original languageEnglish
Article number041801
JournalJapanese journal of applied physics
Volume55
Issue number4
DOIs
Publication statusPublished - 2016 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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