Materials Data on CaIrO3 by Materials Project

Abstract

CaIrO3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.53 Å. Ir4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing IrO6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.00 Å) and four longer (2.06 Å) Ir–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Ir4+ atoms to form distorted corner-sharing OCa2Ir2 tetrahedra. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ca2+ and two equivalent Ir4+ atoms.