New Honeycomb Iridium (V) Oxides: NaIrO${}_3$ and Sr${}_3$CaIr${}_2$O${}_9$

David C. Wallace, Tyrel M. McQueen

We report the structures and physical properties of two new iridates, NaIrO${}_3$ and Sr${}_3$CaIr${}_2$O${}_9$, both of which contain continuous two-dimensional honeycomb connectivity. Na…