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Article Dans Une Revue Journal of Alloys and Compounds Année : 2022

Thermoelectric properties of a high entropy half-Heusler alloy processed by a fast powder metallurgy route

Résumé

A half-Heusler (HH) type high entropy alloy (HEA) Ti2NiCoSnSb has been synthesized by a fast powder metallurgy route for the first time. Mechanical alloying (MA) by wet milling produced a powder with a minor fraction of the HH phase. The dry milling route resulted in the desired single-phase HH material. Consolidation of the nanocrystalline mechanically alloyed (MA) powder by spark plasma sintering (SPS) resulted in a majority HH phase. Interestingly, the nanocrystalline alloy exhibited simultaneous enhancement in the Seebeck coefficient and electrical conductivity, with a maximum ZT of 0.13 at 973 K observed for the dry milled alloy. The band structure obtained by density functional theory (DFT) was in good agreement with the ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy results. The DFT calculations and microstructural analysis suggest that phase separation strongly influenced the thermoelectric properties. The band structure calculations provided a good rationale for the phase evolution and thermoelectric properties.

Dates et versions

hal-04413923 , version 1 (24-01-2024)

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Citer

Anirudha Karati, Soumya Ranjan Mishra, Sanyukta Ghosh, Ramesh Chandra Mallik, Rajashekhara Shabadi, et al.. Thermoelectric properties of a high entropy half-Heusler alloy processed by a fast powder metallurgy route. Journal of Alloys and Compounds, 2022, Journal of Alloys and Compounds, 924, pp.166108. ⟨10.1016/j.jallcom.2022.166108⟩. ⟨hal-04413923⟩
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