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Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C

Beltran-Pitarch, Braulio and Prado-Gonjal, Jesus and Powell, Anthony V. and Ziolkowski, Pawel and Garcıa-Canadas, Jorge (2018) Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C. Journal of Applied Physics. American Institute of Physics (AIP). DOI: 10.1063/1.5036937 ISSN 0021-8979

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Abstract

Impedance spectroscopy has been shown as a promising method to characterize thermoelectric (TE) materials and devices. In particular, the possibility to determine the thermal conductivity λ, electrical conductivity σ, and the dimensionless figure of merit ZT of a TE element, if the Seebeck coefficient S is known, has been reported, although so far for a high-performance TE material (Bi2Te3) at room temperature. Here, we demonstrate the capability of this approach at temperatures up to 250 °C and for a material with modest TE properties. Moreover, we compare the results obtained with values from commercial equipment and quantify the precision and accuracy of the method. This is achieved by measuring the impedance response of a skutterudite material contacted by Cu contacts. The method shows excellent precision (random errors < 4.5% for all properties) and very good agreement with the results from commercial equipment (<4% for λ, between 4% and 6% for σ, and <8% for ZT), which proves its suitability to accurately characterize bulk TE materials. Especially, the capability to provide λ with good accuracy represents a useful alternative to the laser flash method, which typically exhibits higher errors and requires the measurement of additional properties (density and specific heat), which are not necessarily needed to obtain the ZT.

Item URL in elib:https://elib.dlr.de/122827/
Document Type:Article
Title:Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Beltran-Pitarch, BraulioDepartment of Industrial Systems Engineering and Design, Universitat Jaume I, Campus del Riu Sec, 12071 Castellon, SpainUNSPECIFIED
Prado-Gonjal, JesusDepartment of Chemistry, University of Reading, RG6 6AD Reading, United KingdomUNSPECIFIED
Powell, Anthony V.Department of Chemistry, University of Reading, RG6 6AD Reading, United KingdomUNSPECIFIED
Ziolkowski, PawelGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Garcıa-Canadas, JorgeDepartment of Industrial Systems Engineering and Design, Universitat Jaume I, Campus del Riu Sec, 12071 Castellon, SpainUNSPECIFIED
Date:13 July 2018
Journal or Publication Title:Journal of Applied Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1063/1.5036937
Publisher:American Institute of Physics (AIP)
ISSN:0021-8979
Status:Published
Keywords:Thermal conductivity, Electrical resistivity, Dimensionless figure of merit (ZT), Thermoelectric, Impedance spectroscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Antriebsstrang (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:13 Nov 2018 08:34
Last Modified:13 Nov 2018 08:34

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