Complex phosphates containing mono- and trivalent cations

The review surveys the data on the synthesis, structures, thermal stability and physical properties of complex phosphates containing MI and MIII cations generated from double phosphates by the partial replacement M^I → H⁺ or PO₄^3- → X^n- (X^n- = F^-, OH^-, EO₄^n- (VO₄^3-, MoO₄^2-) or S₂O₃^2-). The sizes of the M^I and M^III cations and their ratio have a dominant role in the structure formation of complex phosphates. The prospects of the use of complex phosphates as polyfunctional materials are discussed. The bibliography includes 161 references.