High temperature transport properties of BaZn2Sn2

U. Aydemir*, A. Zevalkink, S. Bux, G. J. Snyder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

BaZn2Sn2 (space group P4/nmm, a = 4.7459(5) Å, c = 11.330(2) Å, Z = 2) crystallizes in the CaBe2Ge2 structure type with a polyanionic framework comprising alternately stacked PbO-like {ZnSn4/4} and anti-PbO-like {SnZn4/4} layers along the c-axis. BaZn2Sn2 samples were obtained by either direct solid state reaction of the elements or from a Sn-flux method in very high yield with very small amount of β-Sn as the secondary phase. The samples were characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). The chemical compositions were determined to be off-stoichiometric with Zn/Sn ratio lower than 1.0 and Sn2 atoms in the crystal structure were found to be either loosely bonded or not bonded which might lead to an incomplete charge balance. Electrical and thermal transport measurements have been performed in the temperature range 300-773 K. BaZn2Sn2 displays the electrical resistivity of a metal (or semimetal) along with very low Seebeck coefficients and relatively high thermal conductivity.

Original languageEnglish (US)
Pages (from-to)402-407
Number of pages6
JournalJournal of Alloys and Compounds
Volume622
DOIs
StatePublished - Feb 15 2015

Keywords

  • Crystal structure
  • Electronic transport
  • Stannides
  • Thermal transport
  • Tin-flux
  • Zintl phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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