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Funct. Mater. 2019; 26 (3): 603-608.

doi:https://doi.org/10.15407/fm26.03.603

Crystallization of complex phosphates based on titanium and bivalent or trivalent metals from cesium and rubidium phosphate self-fluxes

N.Yu.Strutynska1, N.S.Slobodyanik1, Y.A.Titov1, T.Y.Sliva1, I.A.Kraievska2

1T.Shevchenko National University of Kyiv, 64/13 Volodymyrska Str., 01601 Kyiv, Ukraine
2O.Bogomolets National Medical University, 13 T.Shevchenko blvd, 01601 Kyiv, Ukraine

Abstract: 

The particularities of phase formation in the self-flux Cs2O-P2O5-TiO2 system were investigated at molar ratios of Cs/P = 0.9-1.2, and Ti/P = 0.3 over a temperature range of 1000-550 °C. The formation conditions of the complex phosphates Cs2TiOP2O7 (at Cs/P = 1.0) and CsTiOPO4 (at Cs/P = 1.2) were established. It was found that the addition of bi- and trivalent metals oxides into the self-flux MI2O-P2O5-TiO2-MIII2O3 (MIIO) (MI - Cs, Cs/Rb, MII - Co, Ni, MIII - Fe, Mn) system (at molar ratios of MI/P = 1.0 and 1.2, Ti/P = 0.3, Ti/Mn = 1.0 and Cs/Rb = 1.0) caused the formation of MI1+2xTi1-xMIIxOPO4 and MI1+xTi1-xMIIIxOPO4 (MI - Cs, Cs/Rb) (0.3≤e;0.5) phosphates which belong to a cubic system, space group Fd-3m. The obtained phosphates were characterized by the powder X-ray diffraction, FTIR spectroscopy, TG/DTA and elemental analysis.

Keywords: 
cesium, titanium, complex phosphates, FTIR spectroscopy, powder X-ray diffraction.
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