NaIrO3 - A pentavalent post-perovskite
M. Bremholm, S.E. Dutton, P.W. Stephens, R.J. Cava
TL;DR
NaIrO3 is a newly synthesized pentavalent post-perovskite oxide with a layered structure, exhibiting non-metallic behavior and no magnetic ordering, expanding the understanding of high-pressure oxide phases.
Contribution
This paper reports the first example of a pentavalent cation in a post-perovskite structure, synthesized via high pressure methods and characterized in detail.
Findings
NaIrO3 has a layered post-perovskite structure.
NaIrO3 exhibits non-metallic electrical behavior.
NaIrO3 shows no magnetic ordering.
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 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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