title: New A2/3-xRh2O4 compounds with the CaFe2O4 structure where A is a rare earth or Bi.
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.
authors.affiliation: Department of Chemistry and Oregon University Materials Institute, Oregon State University, Corvallis, Oregon 97331-4003, USA.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mizoguchi
authors.forename: L N
authors.initials: LN
authors.lastname: Zakharov
authors.forename: A P
authors.initials: AP
authors.lastname: Ramirez
authors.forename: W J
authors.initials: WJ
authors.lastname: Marshall
authors.forename: A W
authors.initials: AW
authors.lastname: Sleight
authors.forename: M A
authors.initials: MA
authors.lastname: Subramanian
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004553:Electric Conductivity; D008280:Magnetics; D008674:Metals, Rare Earth / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012238:Rhodium / Q000737:chemistry*
chemical_list: D008674:Metals, Rare Earth; D009942:Organometallic Compounds; D010087:Oxides; D012238:Rhodium; D001729:Bismuth