NaIrO3 - A pentavalent post-perovskite

M. Bremholm, S. E. Dutton, P. W. Stephens, R. J. Cava

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Abstract

Sodium iridium (V) oxide, NaIrO3, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO3, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO3. Among the oxide post-perovskites, NaIrO3 is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO 6 octahedra separated by layers of NaO8 bicapped trigonal prisms. NaIrO3 shows no magnetic ordering and resistivity measurements show non-metallic behavior. The crystal structure, electrical and magnetic properties are discussed and compared to known post-perovskites and pentavalent perovskite metal oxides.

Original languageEnglish (US)
Pages (from-to)601-607
Number of pages7
JournalJournal of Solid State Chemistry
Volume184
Issue number3
DOIs
StatePublished - Mar 3 2011

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

  • Electronic properties
  • High oxidation state
  • High pressure synthesis
  • NaIrO
  • Post-perovskite
  • Rietveld refinement

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