The effects of Sn and Y doping on thermoelectric properties of a Heusler Fe1.5TiSb semiconductor was studied. Samples of Fe1.5TiSb1-xSnxand Fe1.5Ti1-xYxSb solid solutions (x=0; 0.05; 0.1) were synthesized by arc and induction melting, annealed at 1073K, and examined by X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray analysis. All alloys of the solid solutions crystallize in the half Heusler structure (space group F4¯ 3m), and have dominant phase Fe1.33TiSb with a small amount of precipitates. Measurements of the transport properties revealed that all the alloys are p-Type semiconductors. In the parent Fe1.5TiSb, substitution of Sb by Sn results in increasing electrical conductivity σ, whereas substitution of Ti Y decreases σ. Measurements of thermal conductivity κ showed that it decreases with substitution Sb for Sn, as well as with substitution of Ti for Y. The highest zT=0.14 (at 473K), was found for the composition Fe1.5TiSb.
|ジャーナル||Materials Today: Proceedings|
|出版ステータス||Published - 2019|
|イベント||17th European Conference on Thermoelectrics, ECT 2019 - Limassol, Cyprus|
継続期間: 2019 9 23 → 2019 9 25
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