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Macroscopic Thermoelectric Inhomogeneities in (AgSbTe<sub>2</sub>)<sub>x</sub>(PbTe)<sub>1-x</sub> materials

Chen, Nancy and Gascoin, Frank and Müller, Eckhard and Karpinski, Gabriele and Stiewe, Christian and Snyder, Jeffrey G. (2005) Macroscopic Thermoelectric Inhomogeneities in (AgSbTe<sub>2</sub>)<sub>x</sub>(PbTe)<sub>1-x</sub> materials. Applied Physics Letters, 87, 171903-1-171903-3. American Institute of Physics. DOI: 10.1063/1.2056590 ISSN 0003-6951

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Official URL: http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=APPLAB000087000017171903000001&idtype=cvips

Abstract

Exceptionally high thermoelectric figure of merit (zT>2), has been reported for (Ag<sub>1-y</sub>SbTe<sub>2</sub>)<sub>0.05</sub>(PbTe)<sub>0.95</sub>, which may involve the nanoscale microstructure. However, conflicting reports on the same materials claim only zT of 1 or less. Here we show that (Ag<sub>1-y</sub>SbTe<sub>2</sub>)<sub>0.05</sub>(PbTe)<sub>0.95</sub> materials are multiphase on the scale of millimeters despite appearing homogeneous by x-ray diffraction and routine electron microscopy. Using a scanning Seebeck microprobe, we find significant variation of Seebeck coefficient (including both n-type and p-type behavior in the same sample) that can explain the discrepancy in reported zT. More homogeneous samples can be prepared with faster cooling rates.

Item URL in elib:https://elib.dlr.de/21453/
Document Type:Article
Title:Macroscopic Thermoelectric Inhomogeneities in (AgSbTe<sub>2</sub>)<sub>x</sub>(PbTe)<sub>1-x</sub> materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chen, NancyCaltech, Pasadena, CA (USA)UNSPECIFIED
Gascoin, FrankCaltech, Pasadena, CA (USA)UNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Karpinski, GabrieleUNSPECIFIEDUNSPECIFIED
Stiewe, ChristianUNSPECIFIEDUNSPECIFIED
Snyder, Jeffrey G.JPL, Pasadena, CA (USA)UNSPECIFIED
Date:17 October 2005
Journal or Publication Title:Applied Physics Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:87
DOI :10.1063/1.2056590
Page Range:171903-1-171903-3
Publisher: American Institute of Physics
ISSN:0003-6951
Status:Published
Keywords:thermoelectric materials, tellurides, thermoelectric properties, figure of merit, Seebeck coefficient, inhomogeneity, Seebeck microprobe
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Müller, Dr.phys. Wolf Eckhard
Deposited On:03 Sep 2007
Last Modified:27 Apr 2009 04:55

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