Données cristallographiques sur deux phosphates de scandium: Sc(PO₃)₃ et Sc₄(P₄O₁₂)₃

The chemical preparation and crystal data for two scandium phosphates are reported. (a) Scandium tetrametaphosphate, Sc₄(P₄O₁₂)₃, is cubic with a = 14.363 (5) Å, and Z = 4. It is isotypic with Al₄(P₄O₁₂)₃. (b) Scandium polyphosphate, Sc(PO₃)₃, is monoclinic with a = 10.84 (1), b = 19.58 (2), c = 9.694 (5) Å, β = 97.92 (5)° and Z = 12. It is isotypic with the C form of Al(PO₃)₃.