Formation of transition metal boride and carbide perovskites related to superconducting MgCNi3

R. E. Schaak, M. Avdeev, W. L. Lee, G. Lawes, H. W. Zandbergen, J. D. Jorgensen, N. P. Ong, A. P. Ramirez, R. J. Cava

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Abstract

A general study of the formation of intermetallic perovskite borides and carbides in the ternary systems AXM3 (A=Mg, Ca, Sc, Y, Lu, Zr, Nb; X=B, C; M=Ni, Ru, Rh, Pd, Pt) is reported. MgBxPd3, MgBxPt3, CaBxPd3, MgC xRh3, LuCxRh3, and ZrC xRh3 represent new intermetallic perovskites that form at a composition that is nominally stoichiometric (x=1). ScBxPd 3, YBxPd3, and NbBxRh3 are new single-phase perovskites that form only at a substoichiometric (x<1) nominal composition. The variable boron content of ABxPd3 (A=Mg, Ca, Sc, Y) was studied using lattice parameter data from X-ray diffraction measurements. For A=Ca and Mg, the unit cell volume increases with increasing boron content for 0.25≤x≤1.0, while boron uptake is limited to 0≤x≤0.5 for A=Sc and Y. Neutron diffraction studies indicate that CaB xPd3 is not actually stoichiometric at a nominal composition of x=1. Rather, saturation of the boron content occurs at CaB 0.76Pd3. Evidence for superconductivity was found in samples of CaBxPd3 (x≥1) and NbBxRh 3, but bulk analysis suggests that superconductivity may be attributed to minority phases.

Original languageEnglish (US)
Pages (from-to)1244-1251
Number of pages8
JournalJournal of Solid State Chemistry
Volume177
Issue number4-5
DOIs
StatePublished - Apr 1 2004

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

  • Crystal structure
  • Intermetallic perovskite
  • Intermetallic superconductor
  • Neutron diffraction
  • Substoichiometric compounds
  • Superconductivity

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