New Honeycomb Iridium (V) Oxides: NaIrO₃ and Sr₃CaIr₂O₉
Wallace, David C. · McQueen, Tyrel M.
Original · EN
We report the structures and physical properties of two new iridates, NaIrO₃ and Sr₃CaIr₂O₉, both of which contain continuous two-dimensional honeycomb connectivity. NaIrO3 is produced by room temperature oxidative deintercalation of sodium from Na₂IrO₃, and contains edge-sharing IrO6 octahedra that form a planar honeycomb lattice. Sr₃CaIr₂O₉, produced via conventional solid-state synthesis, hosts a buckled honeycomb lattice with novel corner-sharing connectivity between IrO6 octahedra. Both of these new compounds are comprised of Ir⁵⁺ (5d⁴) and exhibit negligible magnetic susceptibility. They are thus platforms to investigate the origin of the nonmagnetic behavior exhibited by Ir⁵⁺ oxides, and provide the first examples of a J = 0 state on a honeycomb lattice.
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