On Rhodium Phosphate RhPO4 and Rhodium Arsenic Oxide RhAsO4 with Rutile Structure.

Article abstract of DOI:10.1016/0022-5088(81)90184-3

RhPO//4 and RhAsO//4 were synthesized and an X-ray investigation showed that RhPO//4 crystallizes with the orthorhombic structure of high-temperature CrPO//4. The lattice constants are a equals 1039. 1 pm, b equals 1309. 1 pm, and c equals 639. 1 pm. The tetragonal rutile structure was found for RhAsO//4 with a equals 446. 0 pm and c equals 297. 3 pm. This compound represents a double oxide with a statistical distribution of rhodium and arsenic on the metal atom positions. The octahedral coordination of the arsenic is corroborated by the IR spectrum.