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Nanostructured rocksalt-type solid solution series (Ge1−xSnxTe)nSb2Te3 (n=4, 7, 12; 0≤x≤1): Thermal behavior and thermoelectric properties

Rosenthal, Tobias and Neudert, Lukas and Ganter, Pirmin and de Boor, Johannes and Stiewe, Christian and Oeckler, Oliver (2014) Nanostructured rocksalt-type solid solution series (Ge1−xSnxTe)nSb2Te3 (n=4, 7, 12; 0≤x≤1): Thermal behavior and thermoelectric properties. Journal of Solid State Chemistry, 215, pp. 231-240. Elsevier. DOI: 10.1016/j.jssc.2014.03.031 ISSN 0022-4596

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Abstract

Solid solutions (Ge1−xSnxTe)nSb2Te3 (n=4, 7, 12; 0≤x≤1) represent stable high-temperature phases and can be obtained as metastable compounds by quenching. High-resolution transmission electron microscopy reveals that the quenched (pseudo-)cubic materials exhibit parquet-like nanostructures comparable to, but especially for n=4 more pronounced than in (GeTe)nSb2Te3 (GST materials). The temperature-dependent phase transitions are comparable; however, substitution with Sn significantly lowers the transition temperatures between cubic high-temperature phase and the long range ordered layered phases that are stable at ambient conditions. In addition, the metrics of the quenched Sn-containing materials remains closer to cubic, especially for samples with n=7 or 12. For samples with high defect concentrations (n=4, 7), Sn-substituted samples exhibit electrical conductivities up to 3 times higher than those of corresponding GST materials. Since the difference in thermal conductivity is much less pronounced, this results in a doubling of the thermoelectric figure of merit (ZT) at high temperatures for (Ge0.5Sn0.5Te)4Sb2Te3 as compared to (GeTe)4Sb2Te3. Sn doping in (GeTe)7Sb2Te3 increases the ZT value by a factor of up to 4 which is also due to an increased Seebeck coefficient.

Item URL in elib:https://elib.dlr.de/92540/
Document Type:Article
Title:Nanostructured rocksalt-type solid solution series (Ge1−xSnxTe)nSb2Te3 (n=4, 7, 12; 0≤x≤1): Thermal behavior and thermoelectric properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rosenthal, TobiasLMU Munich, Department of Chemistry, Butenandtstr. 5-13, 81377 Munich, GermanyUNSPECIFIED
Neudert, LukasLMU Munich, Department of Chemistry, Butenandtstr. 5-13, 81377 Munich, GermanyUNSPECIFIED
Ganter, PirminLMU Munich, Department of Chemistry, Butenandtstr. 5-13, 81377 Munich, GermanyUNSPECIFIED
de Boor, JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Oeckler, OliverLeipzig University, IMKM, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Date:29 March 2014
Journal or Publication Title:Journal of Solid State Chemistry
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:215
DOI :10.1016/j.jssc.2014.03.031
Page Range:pp. 231-240
Publisher:Elsevier
ISSN:0022-4596
Status:Published
Keywords:Germanium tin antimony tellurides; Nanostructure; Thermoelectric properties; Solid solutions; Crystal structure elucidation
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemical Processes (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:01 Dec 2014 10:39
Last Modified:01 Dec 2014 10:39

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