Iodo-oxyapatite, the first example from a new class of modulated apatites

摘要

Iodo-oxyapatite [pentadecacalcium iodide oxide nonaphosphate, Ca-15(PO4)(9)IO] was synthesized by a flux method and the structure was solved from single-crystal X-ray data. The crystal structure was refined in the space group P6(3)/m [a = 9.567 (1), c = 20.754 (2) Angstrom and Z = 2] to wR on F of 0.0459. Iodo-oxyapatite has a typical hexagonal apatite structure but the unit cell is tripled along the hexad owing to ordering of the iodide and oxide ions along this direction. [References: 13]