Thermoelectric properties of Mn-doped Ca 5Al 2Sb 6

Alex Zevalkink*, Jessica Swallow, G. Jeffrey Snyder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Ca 5Al 2Sb 6 is a relatively inexpensive Zintl compound exhibiting promising thermoelectric efficiency at temperatures suitable for waste heat recovery. Motivated by our previous studies of Ca 5Al 2Sb 6 doped with Na and Zn, this study focuses on doping with Mn 2+ at the Al 3+ site. While Mn is a successful p-type dopant in Ca 5Al 2Sb 6, we find that incomplete dopant activation yields lower hole concentrations than obtained with either previously investigated dopant. High-temperature Hall effect and Seebeck coefficient measurements show a transition from nondegenerate to degenerate semiconducting behavior in Ca 5Al 2-xMn xSb 6 samples (x = 0.05, 0.1, 0.2, 0.3, 0.4) with increasing Mn content. Ultimately, no improvement in zT is achieved via Mn doping, due in part to the limited carrier concentration range achieved.

Original languageEnglish (US)
Pages (from-to)813-818
Number of pages6
JournalJournal of Electronic Materials
Volume41
Issue number5
DOIs
StatePublished - May 1 2012

Keywords

  • Electronic transport
  • Lattice thermal conductivity
  • Thermoelectric material
  • Zintl compound

ASJC Scopus subject areas

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

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