Study of Local Structure in Selected Organic–Inorganic Perovskites in the Pm3̅m Phase

The local structures of the inorganic component of selected organic–inorganic perovskites (OIPs) are studied by analyzing the X-ray pair distribution function. Whereas the long-range structure of each perovskite is the untilted Pm 3̅ m phase, all the OIPs showed significant internal distortion of the octahedra. Varying the halide has a significant impact on the lattice constant. There is evidence of local lone-pair distortions for certain compositions. The most complex case of disorder appears to be that of CH 3 NH 3 SnBr 3 .