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The Solid Solution Series (GeTe)x(LiSbTe2)2 (1 ≤ x ≤ 11) and the Thermoelectric Properties of (GeTe)11(LiSbTe2)2

Schröder , Thorsten and Schwarzmüller, Stefan and Stiewe, Christian and de Boor , Johannes and Hölzel , Markus and Oeckler, Oliver (2013) The Solid Solution Series (GeTe)x(LiSbTe2)2 (1 ≤ x ≤ 11) and the Thermoelectric Properties of (GeTe)11(LiSbTe2)2. Inorganic Chemistry, 52 (19), pp. 11288-11294. ACS Publications. DOI: 10.1021/ic401516m ISSN 0020-1669

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Abstract

Exchanging one Ge2+ with two Li+ per formula unit in (GeTe)n(Sb2Te3) (n = 1, 2, 3, ...) eliminates cation vacancies, because it leads to an equal number of cations and anions. This substitution results in the solid solution (GeTe)x(LiSbTe2)2 (with x = n – 1, but n not necessarily an integer). For x < 6, these stable compounds crystallize in a rock-salt-type structure with random cation disorder. Neutron data show that a small fraction of Ge occupies tetrahedral voids for x = 2 and 3. For x > 6, (GeTe)x(LiSbTe2)2 forms a GeTe-type structure that shows a phase transition to a cubic high-temperature phase at ca. 280 °C. The thermoelectric properties of (GeTe)11(LiSbTe2)2 have been investigated and show that this compound is a promising thermoelectric material with a ZT value of 1.0 at 450 °C. The high ZT value of the thermodynamically stable compound is caused by a low phononic contribution to the thermal conductivity; probably, Li acts as a “pseudo-vacancy”.

Item URL in elib:https://elib.dlr.de/85896/
Document Type:Article
Title:The Solid Solution Series (GeTe)x(LiSbTe2)2 (1 ≤ x ≤ 11) and the Thermoelectric Properties of (GeTe)11(LiSbTe2)2
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder , ThorstenLMU Munich, Department of Chemistry, Butenandtstr. 5-13 (D), 81377 Munich, GermanyUNSPECIFIED
Schwarzmüller, StefanLMU Munich, Department of Chemistry, Butenandtstr. 5-13 (D), 81377 Munich, GermanyUNSPECIFIED
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor , JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Hölzel , MarkusForschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), TUM, Lichtenbergstr. 1, 85747 Garching, GermanyUNSPECIFIED
Oeckler, OliverLeipzig University, IMKM, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Date:16 September 2013
Journal or Publication Title:Inorganic Chemistry
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:52
DOI :10.1021/ic401516m
Page Range:pp. 11288-11294
Publisher:ACS Publications
ISSN:0020-1669
Status:Published
Keywords:solid soltion; thermoelectric properties
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 - Thermochemische Prozesse (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:02 Dec 2013 15:30
Last Modified:02 Dec 2013 15:30

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