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TAGS-related indium compounds and their thermoelectric properties – the solid solution series (GeTe)_xAgIn_ySb_(1-y)Te_2 (x = 1–12; y = 0.5 and 1)

Schröder, Thorsten and Rosenthal, Tobias and Giesbrecht, Nadja and Maier, Stefan and Scheidt, Ernest-Wilhelm and Scherer, Wolfgang and Snyder, G. Jeffrey and Schnick, Wolfgang and Oeckler, Oliver (2014) TAGS-related indium compounds and their thermoelectric properties – the solid solution series (GeTe)_xAgIn_ySb_(1-y)Te_2 (x = 1–12; y = 0.5 and 1). Journal of Materials Chemistry A, 2 (18). pp. 6384-6395. ISSN 2050-7488. https://resolver.caltech.edu/CaltechAUTHORS:20140521-100751503

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Abstract

Various members of the solid solution series (GeTe)_xAgIn_ySb_(1−y)Te_2 can be obtained by quenching high-temperature phases (x = 12 for y = 1 and x > 5 for y = 0.5). In contrast, high-temperature and high-pressure conditions (2.5 GPa, 350 °C) are required for the synthesis of members with In contents >3.6 atom% (such as x < 12 for y = 1 and x < 5 for y = 0.5) in order to avoid the formation of AgInTe_2. The latter exhibits tetrahedrally coordinated indium atoms under ambient conditions and therefore does not form mixed crystals with tellurides of germanium and antimony that are characterized by sixfold coordinated atom sites. Solid solutions with x ≤ 5 crystallize in rocksalt-type structures with octahedrally coordinated indium, whereas the ones with x > 5 adopt the α-GeTe structure type (3 + 3 coordination). Thus, in all samples investigated, 3 or 4 cations are disordered at one Wyckoff position. The quenched high-temperature or high-pressure phases, respectively, are almost homogeneous. Their powder X-ray diffraction patterns suggest pure phases; yet, high-resolution electron microscopy occasionally reveals a very small extent of nanoscopic precipitates as well as dislocations and twinning. (GeTe)_(5.5)AgIn_(0.5)Sb_(0.5)Te_2 shows a maximal ZT value of 0.75 even when (partial) decomposition into the TAGS material (GeTe)_(11)AgSbTe_2 and chalcopyrite-type AgInTe_2 has occurred at 300 °C. (GeTe)_(5.5)AgInTe_2 prepared under high-pressure conditions exhibits a ZT value of 0.6 at 125 °C, i.e. far below the decomposition temperature and thus is an interesting new low-temperature thermoelectric material.


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ORCID:
AuthorORCID
Maier, Stefan0000-0002-2210-6290
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2014 Royal Society of Chemistry. This Open Access Article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported Licence. Received 5th January 2014 Accepted 6th February 2014. First published online 07 Feb 2014. We thank Christian Minke and Dr Markus Seibald for SEM operation and EDX analyses and Thomas Miller (LMU Munich) for the temperature-dependent powder diffraction experiments. Furthermore, we thank Fivos Drymiotis (California Institute of Technology) for help with the thermoelectric measurements and PD Dr Gerald Wagner (Leipzig University) for his help with the HRTEM interpretation. This investigation was funded by the Deutsche Forschungsgemeinschaft (grant OE530/1-2) and the Studienstifung des deutschen Volkes (scholarship for T.S.).
Funders:
Funding AgencyGrant Number
Deutsche ForschungsgemeinschaftOE530/1-2
Studienstifung des deutschen Volkes scholarshipUNSPECIFIED
Issue or Number:18
Record Number:CaltechAUTHORS:20140521-100751503
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140521-100751503
Official Citation:TAGS-related indium compounds and their thermoelectric properties – the solid solution series (GeTe)xAgInySb1−yTe2 (x = 1–12; y = 0.5 and 1) Thorsten Schröder, Tobias Rosenthal, Nadja Giesbrecht, Stefan Maier, Ernst-Wilhelm Scheidt, Wolfgang Scherer, G. Jeffrey Snyder, Wolfgang Schnick and Oliver Oeckler J. Mater. Chem. A, 2014, 2, 6384-6395 DOI: 10.1039/C4TA00072B
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45867
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 May 2014 19:18
Last Modified:09 Mar 2020 13:19

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