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:	eng
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