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Title: Role of chemically and thermally induced crystal lattice distortion in enhancing the Seebeck coefficient in complex tellurides

Composition and crystal structure of complex materials can significantly change the Seebeck effect, i.e., heat to electrical energy conversion, which is utilized in thermoelectric materials. Despite decades of studies of various thermoelectric materials and their application, the fundamental understanding of this effect still is limited. One of the most efficient groups of thermoelectric materials is based on GeTe, where Ge is replaced by [Ag + Sb], i.e., Ag xSb xGe 50-2xTe 50 alloys, traditionally shown as (GeTe) m(AgSbTe 2) 100-m (TAGS-m series). Here, in this article, we report on the discovery of two unique phenomena in TAGS materials attributed to the effects from [Ag + Sb] atoms: (i) a linear relation between the Seebeck coefficient and rhombohedral lattice distortion, and (ii) resonance-like temperature-induced behavior of the contribution to the Seebeck coefficient produced by [Ag + Sb] atoms. Finally, our findings show that heat to electrical energy conversion strongly depends on the temperature- and compositionally-induced rhombohedral to cubic transformation where [Ag + Sb] atoms play a crucial mediating role.
 [1] ;  [2] ;  [1] ;  [3]
  1. Ames Lab., Ames, IA (United States). Division of Materials Sciences & Engineering
  2. (United States). Department of Physics and Astronomy
  3. (United States). Department of Materials Sciences and Engineering
Publication Date:
Report Number(s):
Journal ID: ISSN 1466-8033
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 18; Journal Issue: 35; Journal ID: ISSN 1466-8033
Royal Society of Chemistry
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; GeTe-based materials; Seebeck effect; lattice rhombohedral distortion; property-composition-structure relations
OSTI Identifier: