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

Levin, E. M.; Kramer, M. J.

doi:10.1039/C6CE01405D

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

Journal Article · Thu Jul 14 00:00:00 EDT 2016 · CrystEngComm

DOI:https://doi.org/10.1039/C6CE01405D· OSTI ID:1355358

Levin, E. M. ^[1]; Kramer, M. J. ^[1]

Ames Lab., Ames, IA (United States). Division of Materials Sciences & Engineering

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_50-2xTe₅₀ alloys, traditionally shown as (GeTe)_m(AgSbTe₂)_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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1355358

Report Number(s):: IS-J-9091

Journal Information:: CrystEngComm, Vol. 18, Issue 35; ISSN 1466-8033

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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