Optimization of the carrier concentration in phase-separated half-Heusler compounds

Julia Krez*, Jennifer Schmitt, G. Jeffrey Snyder, Claudia Felser, Wilfried Hermes, Markus Schwind

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Inspired by the promising thermoelectric properties of phase-separated half-Heusler materials, we investigated the influence of electron doping in the n-type Ti0.3-xZr0.35Hf0.35NiSn compound. The addition of Nb to this compound led to a significant increase in its electrical conductivity, and shifted the maximum Seebeck coefficient to higher temperatures owing to the suppression of intrinsic carriers. This resulted in an enhancement of both the power factor α2σ and figure of merit, zT. The applicability of an average effective mass model revealed the optimized electron properties for samples containing Nb. There is evidence in the literature that the average effective mass model is suitable for estimating the optimized carrier concentration of thermoelectric n-type half-Heusler compounds. This journal is

Original languageEnglish (US)
Pages (from-to)13513-13518
Number of pages6
JournalJournal of Materials Chemistry A
Volume2
Issue number33
DOIs
StatePublished - Sep 7 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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