Local Structure and Influence of Sb Substitution on the Structure-Transport Properties in AgBiSe2

Tim Bernges, Jan Peilstöcker, Moinak Dutta, Saneyuki Ohno, Sean P. Culver, Kanishka Biswas, Wolfgang G. Zeier

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Owing to their intrinsically low thermal conductivity and chemical diversity, materials within the I-V-VI2 family, and especially AgBiSe2, have recently attracted interest as promising thermoelectric materials. However, further investigations are needed in order to develop a more fundamental understanding of the origin of the low thermal conductivity in AgBiSe2, to evaluate possible stereochemical activity of the 6s2 lone pair of Bi3+, and to further elaborate on chemical design approaches for influencing the occurring phase transitions. In this work, a combination of temperature-dependent X-ray diffraction, Rietveld refinements of laboratory X-ray diffraction data, and pair distribution function analyses of synchrotron X-ray diffraction data is used to tackle the influence of Sb substitution within AgBi1-xSbxSe2 (0 -x -0.15) on the phase transitions, local distortions, and off-centering of the structure. This work shows that, similar to other lone-pair-containing materials, local off-centering and distortions can be found in AgBiSe2. Furthermore, electronic and thermal transport measurements, in combination with the modeling of point-defect scattering, highlight the importance of structural characterizations toward understanding changes induced by elemental substitutions. This work provides new insights into the structure-transport correlations of the thermoelectric AgBiSe2.

Original languageEnglish
Pages (from-to)9236-9245
Number of pages10
JournalInorganic chemistry
Volume58
Issue number14
DOIs
Publication statusPublished - Jun 25 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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