NaIrO3—A pentavalent post-perovskite

Sodium iridium (V) oxide, NaIrO{sub 3}, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO{sub 3}, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO{sub 3}. Among the oxide post-pe...

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Bibliographic Details
Published in:Journal of solid state chemistry 2011-03, Vol.184 (3), p.601-607
Main Authors: BREMHOLM, M, DUTTON, S. E, STEPHENS, P. W, CAVA, R. J
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
CRYSTAL STRUCTURE
Exact sciences and technology
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IRIDIUM
MAGNETIC PROPERTIES
OXIDES
PEROVSKITE
Physics
PRISMS
SODIUM
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
SYNTHESIS
VALENCE
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Summary:Sodium iridium (V) oxide, NaIrO{sub 3}, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO{sub 3}, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO{sub 3}. Among the oxide post-perovskites, NaIrO{sub 3} is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO{sub 6} octahedra separated by layers of NaO{sub 8} bicapped trigonal prisms. NaIrO{sub 3} 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.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2011.01.028