Boiko R. Synthesis, structure and properties of double phosphates of alkaline metals, gallium and indium

The dissertation is devoted to investigation of interactions and crystals' formations in molten phosphates and fluorophosphates of alkaline metals. These melts consist oxides of polyvalence metals (Ga2O3, In2O3). This work is devoted to investigation of properties of double phosphates too. It was established that interaction in the systems has complicated character. The series of double phosphates were fixed. It is showed that additions of alkaline metals fluorides into molted M2O-P2O5-In2O3 systems modify the chemical interaction. The substances NaInPO4F, Na3In2(PO4)2F3, KInPO4F and Li3In2(PO4)3 owing to In2O3 solubility increasing were obtained from M2O-P2O5-In2O3-MF systems. Solid solutions МIIn1-xMIIIxP2O7, Na7(In1-xMIIIxP2O7)4PO4, Na3In2-xMIIIx(PO4)3, K3In1-xMIIIx(PO4)2, where МI = Li, Na, K; MIII = Cr, Fe, Mn, were synthesized on the base of alkaline metals and indium double phosphates. The ranges of existing of these solutions were determined. Dependence between conductivity and temperature wasinvestigated for some compounds. Studying of luminescence properties of NaInP2O7, doped with Ce3+, was made. Double phosphate NaTi2(PO4)3 is proposed as matrix for some radioactive waste storage.