Thermoelectric properties of Fe1.5TiSb1-xSnxand Fe1.5Ti1-xYxSb Heusler alloys

Anna Kalugina, Anastasiia Taranova, Andrey Novitskii, Dmitriy Karpenkov, Alexey Sedegov, Vladislav Kurichenko, Andrey Voronin, Hiroyuki Miki, Satyabrata Patnaik, Vladimir Khovaylo

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)3439-3444
Number of pages6
JournalMaterials Today: Proceedings
Volume44
DOIs
Publication statusPublished - 2019
Event17th European Conference on Thermoelectrics, ECT 2019 - Limassol, Cyprus
Duration: 2019 Sep 232019 Sep 25

Keywords

  • Electrical conductivity
  • Heusler alloy
  • Thermal conductivity
  • Thermoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Thermoelectric properties of Fe<sub>1.5</sub>TiSb<sub>1-</sub><sub>x</sub>Sn<sub>x</sub>and Fe<sub>1.5</sub>Ti<sub>1-</sub><sub>x</sub>Y<sub>x</sub>Sb Heusler alloys'. Together they form a unique fingerprint.

Cite this