Thermoelectric properties of Zn-doped Ca 3AlSb 3

Wolfgang G. Zeier, Alex Zevalkink, Eugen Schechtel, Wolfgang Tremel, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Polycrystalline samples of Ca 3Al 1-xZn xSb 3, with x = 0.00, 0.01, 0.02, and 0.05 were synthesized via a combined ball milling and hot pressing technique and the influence of zinc as a dopant on the thermoelectric properties was studied and compared to the previously reported transport properties of sodium-doped Ca 3AlSb 3. Consistent with the transport in the sodium-doped material, substitution of aluminum with zinc leads to p-type carrier conduction that can be sufficiently explained with a single parabolic band model. It is found that, while exhibiting higher carrier mobilities, the doping effectiveness of zinc is lower than that of sodium and the optimum carrier concentration for a maximum figure of merit zT is not reached in this study. We find that the grain size influences the carrier mobility, carrier concentration, and lattice thermal conductivity, leading to improved properties at intermediate temperatures, and highlighting a possible approach for improved figures of merit in this class of materials.

Original languageEnglish (US)
Pages (from-to)9826-9830
Number of pages5
JournalJournal of Materials Chemistry
Volume22
Issue number19
DOIs
StatePublished - May 21 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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