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

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

doi:10.1039/c4ta03000a

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

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

45 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 Ti_0.3-xZr_0.35Hf_0.35NiSn 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 language	English (US)
Pages (from-to)	13513-13518
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	2
Issue number	33
DOIs	https://doi.org/10.1039/c4ta03000a
State	Published - Sep 7 2014

ASJC Scopus subject areas

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

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10.1039/c4ta03000a

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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. This journal is",

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T1 - Optimization of the carrier concentration in phase-separated half-Heusler compounds

AU - Krez, Julia

AU - Schmitt, Jennifer

AU - Jeffrey Snyder, G.

AU - Felser, Claudia

AU - Hermes, Wilfried

AU - Schwind, Markus

PY - 2014/9/7

Y1 - 2014/9/7

N2 - 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

AB - 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

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

Abstract

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