Synthesis of substitutional solid solutions in Na2O-P2O5-In2O3-M2IIIO3 (MIII = Cr, Fe, and Mn) systems

Solid solutions based on Na7(InP2O7)4PO4 and Na3In2(PO4)3, where chromium, iron, and manganese substitute for indium, have been prepared. When chromium and iron substitute for indium in Na7(InP2O7)4PO4, a continuous solid solution series exists. When manganese substitutes for indium, it enters the compound in the oxidation state +3. The substitution of chromium for indium in Na3In2(PO4)3 occurs within the range from 0.11 to 0.74 (mol/mol), and that of iron for indium, from 0.09 to 0.62 (mol/mol). When manganese substitutes for indium, it enters the structure of the crystalline phase in insignificant amounts as a two-charged cation.