New A2/3-xRh2O4 compounds with the CaFe2O4 structure where A is a rare earth or Bi

Inorg Chem. 2009 Jan 5;48(1):204-8. doi: 10.1021/ic801603t.

Abstract

New compounds of the type R(2/3-x)Rh(2)O(4) with the CaFe(2)O(4) structure have been prepared, where R is a rare earth. For crystals grown in a Bi/V/O flux, the rare earth was partially replaced by Bi. No evidence of ordering of the A cation vacancies is found, but the A cations are displaced from the ideal A cation site by about 0.24 A. Electrical conductivity measurements on crystals suggest that the materials are degenerate semiconductors with Seebeck measurements showing p-type behavior. This is consistent with our observation that x in R(2/3-x)Rh(2)O(4) ranges up to about 0.09. The compounds were also characterized by magnetic susceptibility and diffuse reflectance measurements.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Bismuth / chemistry*
  • Crystallography, X-Ray
  • Electric Conductivity
  • Magnetics
  • Metals, Rare Earth / chemistry*
  • Models, Molecular
  • Molecular Conformation
  • Organometallic Compounds / chemistry*
  • Oxides / chemistry*
  • Rhodium / chemistry*

Substances

  • Metals, Rare Earth
  • Organometallic Compounds
  • Oxides
  • Rhodium
  • Bismuth