Thermoelectric Properties of the XCoSb (X: Ti,Zr,Hf) Half-Heusler Alloys

Appala Gandi, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We investigate the thermoelectric properties of the half-Heusler alloys XCoSb (X: Ti,Zr,Hf) by solving Boltzmann transport equations and discuss them in terms of the electronic band structure. The rigid band approximation is employed to address the effects of doping. While many half-Heuser alloys show excellent thermoelectric performance, the materials under study are special by supporting both n- and p-doping. We identify the reasons for this balanced thermoelectric transport and explain why experimentally p-doping is superior to n-doping. We also determine the spectrum of phonon mean free paths to guide grain refinement methods to enhance the thermoelectric figure of merit.
Original languageEnglish (US)
Pages (from-to)1700419
Journalphysica status solidi (b)
Volume254
Issue number11
DOIs
StatePublished - Sep 15 2017

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