Crystal structure and physical properties of new Ca2TGe3 (T = Pd and Pt) germanides

T. Klimczuk, Weiwei Xie, M. J. Winiarski, R. Kozioł, L. S. Litzbarski, Huixia Luo, R. J. Cava

Research output: Contribution to journalArticle

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Abstract

The crystallographic, electronic transport and thermal properties of Ca2PdGe3 and Ca2PtGe3 are reported. The compounds crystalize in an ordered variant of the AlB2 crystal structure, in space group P6/mmm, with the lattice parameters a = 8.4876(4) Å/8.4503(5) Å and c = 4.1911(3) Å/4.2302(3) Å for Ca2PdGe3 and Ca2PtGe3, respectively. The resistivity data exhibit metallic behavior with residual-resistivity-ratios (RRR) of 13 for Ca2PdGe3 and 6.5 for Ca2PtGe3. No superconducting transition is observed down to 0.4 K. Specific heat studies reveal similar values of the Debye temperatures and Sommerfeld coefficients: ΘD = 298 K, γ = 4.1 mJ mol1 K2 and ΘD = 305 K, γ = 3.2 mJ mol1 K2 for Ca2PdGe3 and Ca2PtGe3, respectively. The low value of γ is in agreement with the electronic structure calculations.

Original languageEnglish (US)
Pages (from-to)95-100
Number of pages6
JournalJournal of Solid State Chemistry
Volume243
DOIs
StatePublished - Nov 1 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • AlB2-type structure
  • Germanides
  • Intermetallic compounds

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