Thermoelectric properties of highly deformed and subsequently annealed p-type (Bi0.25Sb0.75)2Te3 alloys

Sung Jin Jung, Seong Keun Kim, Hyung Ho Park, Dow Bin Hyun, Seung Hyub Baek, Jin Sang Kim

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2 Citations (Scopus)

Abstract

The effects of mechanical deformation and subsequent annealing on the thermoelectric properties and microstructure have been investigated for p-type (Bi0.25Sb0.75)2Te3 alloys prepared by melting followed by quenching. The mechanically deformed pellets were prepared by repetition of cold-pressing of quenched samples at room temperature. Cold-pressed pellets were then annealed at 300°C in vacuum, and the thermoelectric properties and microstructure were traced through the course of the heat treatment. For the heavily deformed samples, the Seebeck coefficient rapidly increased at the very early stage of annealing and did not change as the annealing time increased, due to recrystallization of a new δ-phase which equilibrated at the annealing temperature of 300°C (δ300- phase). At the initial stage of annealing (recovery stage), the electrical resistivity sharply increased, probably due to the interaction of antistructural defects with vacancies produced during the cold-pressing treatment. However, for the lightly deformed samples, recrystallization occurred only at some portion of the grain boundaries, and the newly generated δ300- phase slowly replaced the original, as-solidified δingot-phase.

Original languageEnglish
Pages (from-to)1726-1732
Number of pages7
JournalJournal of Electronic Materials
Volume43
Issue number6
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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