Thermoelectric properties of chalcogenides with the spinel structure

Jeffrey J. Snyder*, T. Caillat, J. P. Fleurial

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Many compounds with the spinel structure type have been analyzed for their thermoelectric properties. Published data was used to augment experimental results presented here and to select promising thermoelectric spinels. Compounds studied here include Cu0.5A10.5Cr2Se4, Cu0.5,Co0.5Cr2Se4, Cu0.5In0.5Cr2Se4 and CuIr2Se4. Many exhibit low lattice thermal conductivity of about 20 mW/cmK, independent of temperature. Two representative series of compounds GaxCu1-xCr2Se4 0<x < 0.6 and CuxZn1-xCr2Se4 0<x< 0.3 have been studied to examine the doping region of interest for both high and low temperature thermoelectric applications. Ferromagnetic, small polaron semiconductors are found in both series of compounds. GaxCu1-xCr2Se4 shows a metal insulator transition, from a p-type metal at x=0 to a p-type and then n-type semiconductor as x crosses 1/2. The maximum figure of merit ZT is of order 0.1. CuxZn1-xCx2Se4 transitions from a p-type semiconductor to a p-type metal as x increases.

Original languageEnglish (US)
Pages (from-to)67-73
Number of pages7
JournalMaterials Research Innovations
Volume5
Issue number2
DOIs
StatePublished - Oct 1 2001

Keywords

  • Ferromagnet
  • Metal-insulator transition
  • Polaron semiconductor
  • Thermoelectric
  • Thermopower

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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