Nb掺杂对微波制备TiCoSb Half-Heusler合金热电性能的提升

doi:10.3976/j.issn.1002-4026.20230101

Abstract

Abstract:

Along with the long preparation cycle time and high cost of conventional preparation methods, the inherent high thermal conductivity of TiCoSb Half-Heusler alloy limited its commercial application. Herein, Ti_1-_xNb_xCoSb Half-Heusler alloys with low thermal conductivity were successfully prepared by microwave synthesis combined with rapid hot-pressing sintering, which substantially shortened the preparation cycle and increased the density of TiCoSb Half-Heusler alloys. Furthermore, we studied the effects of Nb substitution at Ti sites on the phase composition, composition distribution, and thermoelectric transport properties of Ti_1-_xNb_x CoSb Half-Heusler thermoelectric materials. Additionally, the figure of merit(ZT) of Ti_1-_xNb_x CoSb samples were considerably optimized under the combined effects of increasing power factor and decreasing lattice thermal conductivity. The results showed that the Ti_0.93Nb_0.07CoSb sample had a maximum ZT of 0.1 at 725 K, which was two orders of magnitude higher than that of the TiCoSb sample prepared by the same process.

Key words: Half-Heusler, Ti_1-_xNb_x CoSb, microwave, thermoelectric properties

CLC Number:

TN37

ZHANG Ruipeng, KONG Jianbiao, HOU Yangbo, BO Lin, WANG Wenying, WANG Xinglong, ZHAO Linghao, ZHU Junliang, ZHAO Degang. Enhanced thermoelectric properties of Nb-doped TiCoSb Half-Heusler alloys prepared by microwave method[J].Shandong Science, 2024, 37(2): 47-54.

Figures/Tables 7

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Table 1

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References 36

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组分	密度/(g·cm^-3)	致密度/%	载流子浓度/(10²⁰cm^-3)	载流子迁移率/(cm²·V^-1·s^-1)
TiCoSb	7.13	95.70	5.08	2.95
Ti_0.99Nb_0.01CoSb	7.01	94.09	5.74	2.72
Ti_0.97Nb_0.03CoSb	7.08	95.03	7.13	2.63
Ti_0.95Nb_0.05CoSb	7.14	95.84	8.69	2.58
Ti_0.93Nb_0.07CoSb	7.19	96.51	10.26	2.43

Enhanced thermoelectric properties of Nb-doped TiCoSb Half-Heusler alloys prepared by microwave method

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