Structure and thermoelectric properties of SrBiTe3; 12-fold superstructure caused by distortion of the two-dimensional Te-Nets

Kyoung Shin Choi, Duck Young Chung, Joy Heising, Paul W. Brazis, Carl R. Kannewurf, Mercouri G. Kanatzidis

Research output: Contribution to journalConference article

Abstract

The ternary compound, SrBiTe3, was prepared by the molten flux method. It crystallizes in the orthorhombic space group Pmmn with a=4.665(2) angstrom, b=4.517(2) angstrom, c=16.129 angstrom, and Z=2. The compound is composed of a NaCl-type [Bi2Te4]2- layer and a flat square (Te2)2- net with equal Te-Te distances of 3.24 angstrom. The Sr2+ ions are stabilized between the layers in monocapped square antiprismatic sites. X-ray and electron diffraction studies reveal a 12-fold superstructure due to subtle distortions within the Te net of the compound. The superstructure was refined in the monoclinic space group C2 with a=27.923(5) angstrom, b=32.228(6) angstrom, c=4.5069(9) angstrom, β=90.000(3)°. The compound is a semiconductor with a band gap value of 0.14 eV. It melts incongruently at 613°C.

Original languageEnglish
Pages (from-to)117-122
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume545
Publication statusPublished - Jan 1 1999
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: Nov 30 1998Dec 3 1998

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ASJC Scopus subject areas

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

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