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Large Thermoelectric Figure of Merit at High Temperature in Czochralski-grown Clathrate Ba<sub>8</sub>Ga<sub>16</sub>Ge<sub>30</sub>

Saramat, Ali and Svenson, G. and Palmqvist, Anders and Stiewe, Christian and Müller, Eckhard and Platzek, Dieter and Williams, Simon and Rowe, D.M. (2006) Large Thermoelectric Figure of Merit at High Temperature in Czochralski-grown Clathrate Ba<sub>8</sub>Ga<sub>16</sub>Ge<sub>30</sub>. Journal of Applied Physics, 99, 023708-1-5.

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Abstract

The Czochralski method was used to grow a 46-mm-long crystal of the Ba8Ga16Ge30 clathrate, which was cut into disks that were evaluated for thermoelectric performance. The Seebeck coefficient and electrical and thermal conductivities all showed evidence of a transition from extrinsic to intrinsic behavior in the range of 600–900 K. The corresponding figure of merit ZT was found to be a record high of 1.35 at 900 K and with an extrapolated maximum of 1.63 at 1100 K. This makes the Ba8Ga16Ge30 clathrate an exceptionally strong candidate for medium and high-temperature thermoelectric applications.

Item URL in elib:https://elib.dlr.de/45934/
Document Type:Article
Title:Large Thermoelectric Figure of Merit at High Temperature in Czochralski-grown Clathrate Ba<sub>8</sub>Ga<sub>16</sub>Ge<sub>30</sub>
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Saramat, AliDepartment of Materials and Surface Chemistry, Chalmers University of Technology, Göteborg, SwedenUNSPECIFIED
Svenson, G.Department of Materials and Surface Chemistry, Chalmers University of Technology, Göteborg, SwedenUNSPECIFIED
Palmqvist, AndersDepartment of Materials and Surface Chemistry, Chalmers University of Technology, Göteborg, SwedenUNSPECIFIED
Stiewe, ChristianUNSPECIFIEDUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Platzek, DieterUNSPECIFIEDUNSPECIFIED
Williams, SimonNEDO Centre for Thermoelectric Engineering, University of Cardiff, UKUNSPECIFIED
Rowe, D.M.NEDO Centre for Thermoelectric Engineering, University of Cardiff, UKUNSPECIFIED
Date:January 2006
Journal or Publication Title:Journal of Applied Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:99
Page Range:023708-1-5
Status:Published
Keywords:Clathrate, Thermoelectrics, Czochralski, single-crystal
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: Stiewe, Dr.rer.nat Christian
Deposited On:08 Jan 2007
Last Modified:27 Apr 2009 13:17

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