Structural changes in thermoelectric SnSe at high pressures

I. Loa, R. J. Husband, R. A. Downie, S. R. Popuri, J-W G. Bos

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Abstract

The crystal structure of the thermoelectric material tin selenide has been investigated with angle-dispersive synchrotron x-ray powder diffraction under hydrostatic pressure up to 27 GPa. With increasing pressure, a continuous evolution of the crystal structure from the GeS type to the higher-symmetry TlI type was observed, with a critical pressure of 10.5(3) GPa. The orthorhombic high-pressure modification, beta'-SnSe, is closely related to the pseudo-tetragonal high-temperature modification at ambient pressure. The similarity between the changes of the crystal structure at elevated temperatures and at high pressures suggests the possibility that strained thin films of SnSe may provide a route to overcoming the problem of the limited thermal stability of beta-SnSe at high temperatures.

Original languageEnglish
Article number072202
Number of pages7
JournalJournal of Physics: Condensed Matter
Volume27
Issue number7
DOIs
Publication statusPublished - 28 Jan 2015

Keywords

  • SnSe
  • thermoelectric
  • crystal structure
  • high pressure
  • IV-VI COMPOUNDS
  • PHASE-TRANSITION
  • TEMPERATURE
  • CRYSTALS
  • SPECTRA
  • GESE

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