Thermoelectric properties and high-temperature stability of the Ti1-xVxCoSb1-xSnx half-Heusler alloys

Maryana Asaad; Jim Buckman; R. I. Smith; Jan-Willem G Bos

doi:10.1039/c6ra09549f

Thermoelectric properties and high-temperature stability of the Ti_1-xV_xCoSb_1-xSn_x half-Heusler alloys

Maryana Asaad, Jim Buckman, R. I. Smith, Jan-Willem G Bos^*

^*Corresponding author for this work

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

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Abstract

Half-Heuslers (HHs) are attracting widespread interest for thermoelectric waste heat recovery. This manuscript extends the known TiCoSb based HH compositions and provides new insight into their high-temperature stability. X-ray powder diffraction revealed an upper solubility limit near x = 0.4 for the Ti_1-xV_xCoSb_1-xSn_x series. Rietveld analysis of neutron powder diffraction data indicated that TiCoSb is stoichiometric, and confirmed that V and Sn are successfully co-substituted. Scanning electron microscopy revealed small grain sizes (2 and crystalline CoSb, suggesting that the degradation is driven by exposure to trace amounts of oxygen. The unintentional incorporation of Ta leads to n-type doping and maximum power factors S²/ρ = 0.55 mW m^-1 K^-2 at 550 K and S²/ρ = 0.8 mW m^-1 K^-2 at 900 K were observed for TiCoSb and the x = 0.3 sample, respectively.

Original language	English
Pages (from-to)	56511-56517
Number of pages	7
Journal	RSC Advances
Volume	6
Issue number	61
DOIs	https://doi.org/10.1039/c6ra09549f
Publication status	Published - 2 Jun 2016

ASJC Scopus subject areas

General Chemical Engineering
General Chemistry

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title = "Thermoelectric properties and high-temperature stability of the Ti1-xVxCoSb1-xSnx half-Heusler alloys",

abstract = "Half-Heuslers (HHs) are attracting widespread interest for thermoelectric waste heat recovery. This manuscript extends the known TiCoSb based HH compositions and provides new insight into their high-temperature stability. X-ray powder diffraction revealed an upper solubility limit near x = 0.4 for the Ti1-xVxCoSb1-xSnx series. Rietveld analysis of neutron powder diffraction data indicated that TiCoSb is stoichiometric, and confirmed that V and Sn are successfully co-substituted. Scanning electron microscopy revealed small grain sizes (2 and crystalline CoSb, suggesting that the degradation is driven by exposure to trace amounts of oxygen. The unintentional incorporation of Ta leads to n-type doping and maximum power factors S2/ρ = 0.55 mW m-1 K-2 at 550 K and S2/ρ = 0.8 mW m-1 K-2 at 900 K were observed for TiCoSb and the x = 0.3 sample, respectively.",

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AU - Buckman, Jim

AU - Smith, R. I.

AU - Bos, Jan-Willem G

PY - 2016/6/2

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N2 - Half-Heuslers (HHs) are attracting widespread interest for thermoelectric waste heat recovery. This manuscript extends the known TiCoSb based HH compositions and provides new insight into their high-temperature stability. X-ray powder diffraction revealed an upper solubility limit near x = 0.4 for the Ti1-xVxCoSb1-xSnx series. Rietveld analysis of neutron powder diffraction data indicated that TiCoSb is stoichiometric, and confirmed that V and Sn are successfully co-substituted. Scanning electron microscopy revealed small grain sizes (2 and crystalline CoSb, suggesting that the degradation is driven by exposure to trace amounts of oxygen. The unintentional incorporation of Ta leads to n-type doping and maximum power factors S2/ρ = 0.55 mW m-1 K-2 at 550 K and S2/ρ = 0.8 mW m-1 K-2 at 900 K were observed for TiCoSb and the x = 0.3 sample, respectively.

AB - Half-Heuslers (HHs) are attracting widespread interest for thermoelectric waste heat recovery. This manuscript extends the known TiCoSb based HH compositions and provides new insight into their high-temperature stability. X-ray powder diffraction revealed an upper solubility limit near x = 0.4 for the Ti1-xVxCoSb1-xSnx series. Rietveld analysis of neutron powder diffraction data indicated that TiCoSb is stoichiometric, and confirmed that V and Sn are successfully co-substituted. Scanning electron microscopy revealed small grain sizes (2 and crystalline CoSb, suggesting that the degradation is driven by exposure to trace amounts of oxygen. The unintentional incorporation of Ta leads to n-type doping and maximum power factors S2/ρ = 0.55 mW m-1 K-2 at 550 K and S2/ρ = 0.8 mW m-1 K-2 at 900 K were observed for TiCoSb and the x = 0.3 sample, respectively.

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Thermoelectric properties and high-temperature stability of the Ti_1-xV_xCoSb_1-xSn_x half-Heusler alloys

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