Synthesis in molten alkali metal polythiophosphate fluxes. The new quaternary bismuth and antimony thiophosphates ABiP2S7 (A = K, Rb), A3M(PS4)2 (A = K, Rb, Cs; M = Sb, Bi), Cs3Bi2(PS4)3, and Na0.16Bi1.28P2S6

Article abstract of DOI:10.1016/0925-8388(95)02161-2

The molten alkali metal polychalcogenide flux method was used to prepare the new compounds ABiP₂S₇ (A = K, Rb), A₃M(PS₄)₂ (A = K, Rb, Cs; M = Sb, Bi), Cs₃Bi₂ (PS₄)₃, and Na_0.16Bi_1.28P₂S₆. The structural diversity in this family of compounds ranges from the one-dimensional non-centrosymmetric chains of A₃M(PS₄)₂ and the layered compounds, ABiP₂S₇ and Cs₃Bi₂ (PS₄)₂, to the dense three-dimensional framework of Na_0.16Bi_1.28P₂S₆. Their synthesis, structural characterization, optical absorption and thermal properties are reported.