NaIrO3 - A pentavalent post-perovskite

Details NaIrO3 - A pentavalent post-perovskite NaIrO3 - A pentavalent post-perovskite

2010-11-23

arxiv.org/abs/1011.5125v2

Physics

Condensed Matter

Materials Science

22 pages, 5 figures. Submitted to Journal of Solid State Chemistry

Scientific paper

10.1016/j.jssc.2011.01.028

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 analogue 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 IrO6 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.

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