Reduction of Hf via Hf/Zr Substitution in Mechanically Alloyed (Hf,Ti)CoSb Half-Heusler Solid Solutions

Ioanna Ioannou; Andreas Delimitis; Yaniv Gelbstein; Theodora Kyratsi

doi:10.3390/inorganics10040051

Reduction of Hf via Hf/Zr Substitution in Mechanically Alloyed (Hf,Ti)CoSb Half-Heusler Solid Solutions

Ioanna Ioannou, Andreas Delimitis, Yaniv Gelbstein, Theodora Kyratsi

Department of Materials Engineering

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

6 Scopus citations

Abstract

(Hf,Zr,Ti)Co(Sb,Sn) Solid solutions were prepared by mechanical-alloying followed by hot-press method as an attempt to reduce Hf concentration and therefore the material’s cost with-out negatively affecting the thermoelectric performance. To this end, two different methods were applied: (a) Hf substitution with its lighter and cheaper homologue Zr; and (b) fine tuning of carrier concentration by the substitution of Sb with Sn. The isoelectronic substitution of Hf with Zr was investigated in Hf_0.6-xZr_xTi_0.4CoSb_0.8Sn_0.2 solid solutions and resulted in lower power factors and ZTs. However, the low thermal conductivity of Hf_0.4Zr_0.2Ti_0.4CoSb_0.8Sn_0.2 contributed in achieving a relatively good ZT~0.67 at 970 K. The effect of charge carrier concentration was investigated by preparing Hf_0.4Zr_0.2Ti_0.4CoSb_1-ySn_y (y = 0.15–0.25) compounds. Hf_0.4Zr_0.2Ti_0.4CoSb_0.83Sn_0.17 composition prepared by six hours milling reached the highest ZT of 0.77 at 960 K.

Original language	English
Article number	51
Journal	Inorganics
Volume	10
Issue number	4
DOIs	https://doi.org/10.3390/inorganics10040051
State	Published - 1 Apr 2022

Keywords

Hf replacement
ball milling
half-Heusler
hot-press sintering
mechanical alloying
thermoelectric materials

ASJC Scopus subject areas

Inorganic Chemistry

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10.3390/inorganics10040051

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title = "Reduction of Hf via Hf/Zr Substitution in Mechanically Alloyed (Hf,Ti)CoSb Half-Heusler Solid Solutions",

abstract = "(Hf,Zr,Ti)Co(Sb,Sn) Solid solutions were prepared by mechanical-alloying followed by hot-press method as an attempt to reduce Hf concentration and therefore the material{\textquoteright}s cost with-out negatively affecting the thermoelectric performance. To this end, two different methods were applied: (a) Hf substitution with its lighter and cheaper homologue Zr; and (b) fine tuning of carrier concentration by the substitution of Sb with Sn. The isoelectronic substitution of Hf with Zr was investigated in Hf0.6-xZrxTi0.4CoSb0.8Sn0.2 solid solutions and resulted in lower power factors and ZTs. However, the low thermal conductivity of Hf0.4Zr0.2Ti0.4CoSb0.8Sn0.2 contributed in achieving a relatively good ZT~0.67 at 970 K. The effect of charge carrier concentration was investigated by preparing Hf0.4Zr0.2Ti0.4CoSb1-ySny (y = 0.15–0.25) compounds. Hf0.4Zr0.2Ti0.4CoSb0.83Sn0.17 composition prepared by six hours milling reached the highest ZT of 0.77 at 960 K.",

keywords = "Hf replacement, ball milling, half-Heusler, hot-press sintering, mechanical alloying, thermoelectric materials",

author = "Ioanna Ioannou and Andreas Delimitis and Yaniv Gelbstein and Theodora Kyratsi",

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AU - Ioannou, Ioanna

AU - Delimitis, Andreas

AU - Gelbstein, Yaniv

AU - Kyratsi, Theodora

PY - 2022/4/1

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N2 - (Hf,Zr,Ti)Co(Sb,Sn) Solid solutions were prepared by mechanical-alloying followed by hot-press method as an attempt to reduce Hf concentration and therefore the material’s cost with-out negatively affecting the thermoelectric performance. To this end, two different methods were applied: (a) Hf substitution with its lighter and cheaper homologue Zr; and (b) fine tuning of carrier concentration by the substitution of Sb with Sn. The isoelectronic substitution of Hf with Zr was investigated in Hf0.6-xZrxTi0.4CoSb0.8Sn0.2 solid solutions and resulted in lower power factors and ZTs. However, the low thermal conductivity of Hf0.4Zr0.2Ti0.4CoSb0.8Sn0.2 contributed in achieving a relatively good ZT~0.67 at 970 K. The effect of charge carrier concentration was investigated by preparing Hf0.4Zr0.2Ti0.4CoSb1-ySny (y = 0.15–0.25) compounds. Hf0.4Zr0.2Ti0.4CoSb0.83Sn0.17 composition prepared by six hours milling reached the highest ZT of 0.77 at 960 K.

AB - (Hf,Zr,Ti)Co(Sb,Sn) Solid solutions were prepared by mechanical-alloying followed by hot-press method as an attempt to reduce Hf concentration and therefore the material’s cost with-out negatively affecting the thermoelectric performance. To this end, two different methods were applied: (a) Hf substitution with its lighter and cheaper homologue Zr; and (b) fine tuning of carrier concentration by the substitution of Sb with Sn. The isoelectronic substitution of Hf with Zr was investigated in Hf0.6-xZrxTi0.4CoSb0.8Sn0.2 solid solutions and resulted in lower power factors and ZTs. However, the low thermal conductivity of Hf0.4Zr0.2Ti0.4CoSb0.8Sn0.2 contributed in achieving a relatively good ZT~0.67 at 970 K. The effect of charge carrier concentration was investigated by preparing Hf0.4Zr0.2Ti0.4CoSb1-ySny (y = 0.15–0.25) compounds. Hf0.4Zr0.2Ti0.4CoSb0.83Sn0.17 composition prepared by six hours milling reached the highest ZT of 0.77 at 960 K.

KW - Hf replacement

KW - ball milling

KW - half-Heusler

KW - hot-press sintering

KW - mechanical alloying

KW - thermoelectric materials

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Reduction of Hf via Hf/Zr Substitution in Mechanically Alloyed (Hf,Ti)CoSb Half-Heusler Solid Solutions

Abstract

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