Synthesis and crystal structure of Ba3Si4C2

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3 Citations (Scopus)

Abstract

SiC powder prepared by the Na flux method at 1023 K for 24 h and Ba were used as starting materials for synthesis of tribarium tetrasilicide acetylenide, Ba3Si4C2. Single crystals of the compound were obtained by heating the starting materials with Na at 1123 K for 1 h and by cooling to 573 K at a cooling rate of -5.5 K/h. The single crystal X-ray diffraction peaks were indexed with tetragonal cell dimensions of a = 8.7693(4) and c = 12.3885(6) Å, space group I4/mcm (No.140). Ba3Si4C2 has the Ba3Ge4C2 type structure which can be described as a cluster-replacement derivative of perovskite (CaTiO3), and contains isolated anion groups of slightly compressed [Si4]4- tetrahedra and [C2]2- dumbbells. The electrical conductivity measured for a not well-sintered polycrystalline sample was 2.6 × 10-2-7 × 10-3 S cm-1 in the temperature range of 370-600 K and slightly increased with increasing temperature. The Seebeck coefficient showed negative values of around -200 to -300 μV K-1.

Original languageEnglish
Pages (from-to)70-73
Number of pages4
JournalJournal of Alloys and Compounds
Volume486
Issue number1-2
DOIs
Publication statusPublished - 2009 Nov 3

Keywords

  • BaSiC
  • Crystal structure
  • Electrical conductivity
  • Na flux
  • Seebeck coefficient
  • Single crystal
  • X-ray diffraction
  • Zintl anion

ASJC Scopus subject areas

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

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