Oxysulfure de scandium Sc2O2S

Abstract Sc2O2S is hexagonal, P6 3 mmc , a = 3.5196(4) A, c = 12.519(2) A, Z = 2, Dc = 3.807 g cm−3, Dm = 4.014 g cm−3, μ(MoKα) = 55.51 cm−1. The final R value is 0.038 for 205 symmetry-independent reflections. This scandium oxysulfide has c = 12.52 A, twice the value found in rare earth oxysulfides. An La2O2S cell combined with its reflection in a (001) mirror gives the Sc2O2S cell.