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Thermoelectric properties of spark plasma sintered composites based on TiNiSn half-Heusler alloys

Published online by Cambridge University Press:  07 June 2011

Yaniv Gelbstein ,
Nadav Tal ,
Aviad Yarmek ,
Yoav Rosenberg ,
Moshe P. Dariel ,
Siham Ouardi ,
Benjamin Balke ,
Claudia Felser  and
Martin Köhne
Yaniv Gelbstein*
Affiliation:
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
Nadav Tal
Affiliation:
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
Aviad Yarmek
Affiliation:
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
Yoav Rosenberg
Affiliation:
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
Moshe P. Dariel
Affiliation:
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
Siham Ouardi
Affiliation:
Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University, Mainz, Germany
Benjamin Balke
Affiliation:
Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University, Mainz, Germany
Claudia Felser
Affiliation:
Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University, Mainz, Germany
Martin Köhne
Affiliation:
Robert Bosch GmbH, 70049 Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Half-Heusler (HH) and especially TiNiSn-based alloys have shown high potential as thermoelectric (TE) materials for power generation applications. The reported transport properties show, however, a significant spread of results, due mainly to the difficulty in fabricating single-phase HH samples in these multicomponent and multiphased systems. In particular, little attention has been paid to the influence of the various minority phases on the TE performance of these compounds. A clear understanding of these issues is mandatory for the design of improved and stable TE HH-based composites. This study examines the structural and compositional influence of the residual metallic (Sn) and intermetallic phases (mainly Ti6Sn5 and the Heusler compound TiNi2Sn) on the TE properties of the TiNiSn HH compounds processed by spark plasma sintering.

Keywords

ThermoelectricThermoelectricityDopant
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 15: Focus Issue: Advances in Thermoelectric Materials , 14 August 2011 , pp. 1919 - 1924
Copyright
Copyright © Materials Research Society 2011

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