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Issue 33, 2014
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Optimization of the carrier concentration in phase-separated half-Heusler compounds

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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.

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

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Publication details

The article was received on 13 Jun 2014, accepted on 20 Jun 2014 and first published on 23 Jun 2014


Article type: Paper
DOI: 10.1039/C4TA03000A
Citation: J. Mater. Chem. A, 2014,2, 13513-13518
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    Optimization of the carrier concentration in phase-separated half-Heusler compounds

    J. Krez, J. Schmitt, G. Jeffrey Snyder, C. Felser, W. Hermes and M. Schwind, J. Mater. Chem. A, 2014, 2, 13513
    DOI: 10.1039/C4TA03000A

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