Structural phase transitions and thermoelectric properties of AgPb 18SbTe 20 under compression

Ravhi S. Kumar, Mahalingam Balasubramanian, Matthew Jacobsen, Arunkumar Bommannavar, Mercouri Kanatzidis, Seiji Yoneda, Andrew L. Cornelius

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Abstract

The high-figure-of-merit thermoelectric material AgPb 18SbTe 20 has been investigated by in situ angular-dispersive x-ray diffraction (XRD) and x-ray absorption fine-structure (XAFS) measurements up to 30 GPa. Resistivity and thermopower were measured with Bridgman-type opposed metal anvil cells. The results show that the ambient cubic (Fm̄3m) structure transforms to orthorhombic (Pnma) at 6.4 GPa and then to the CsCl-type (Pm̄3m) structure at 15 GPa. The ambient cubic (Fm̄3m) phase is found to be recoverable on releasing the pressure. The thermoelectric power is found to increase with pressure for the cubic phase. The XAFS studies performed at the Pb L 3-edge and Ag K-edge along with resistivity studies complement the XRD findings.

Original languageEnglish
Pages (from-to)1828-1831
Number of pages4
JournalJournal of Electronic Materials
Volume39
Issue number9
DOIs
Publication statusPublished - Sep 1 2010

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Keywords

  • AgPb SbTe
  • structural phase transition
  • x-ray diffraction

ASJC Scopus subject areas

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

Cite this

Kumar, R. S., Balasubramanian, M., Jacobsen, M., Bommannavar, A., Kanatzidis, M., Yoneda, S., & Cornelius, A. L. (2010). Structural phase transitions and thermoelectric properties of AgPb 18SbTe 20 under compression. Journal of Electronic Materials, 39(9), 1828-1831. https://doi.org/10.1007/s11664-010-1088-5