APL Materials (Oct 2016)

Improved mechanical properties of thermoelectric (Bi0.2Sb0.8)2Te3 by nanostructuring

  • M. G. Lavrentev,
  • V. B. Osvenskii,
  • Yu. N. Parkhomenko,
  • G. I. Pivovarov,
  • A. I. Sorokin,
  • L. P. Bulat,
  • H.-S. Kim,
  • I. T. Witting,
  • G. J. Snyder,
  • V. T. Bublik,
  • N. Yu. Tabachkova

DOI
https://doi.org/10.1063/1.4953173
Journal volume & issue
Vol. 4, no. 10
pp. 104807 – 104807-9

Abstract

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Temperature-dependent strength of Bi-Sb-Te under uniaxial compression is investigated. Bi-Sb-Te samples were produced by three methods: vertical zone-melting, hot extrusion, and spark plasma sintering (SPS). For zone-melted and extruded samples, the brittle-ductile transition occurs over a temperature range of 200-350 °C. In nanostructured samples produced via SPS, the transition is observed in a narrower temperature range of 170-200 °C. At room temperature, the strength of the nanostructured samples is higher than that of zone-melted and extruded samples, but above 300 °C, all samples decrease to roughly the same strength.