Synthesis of condensed double cesium manganese phosphates in melts of polyphosphoric acids

This work is a continuation of investigations to establish the composition and formation conditions of condensed double cesium manganese phosphates and obtain x-ray and other characteristics of the compounds isolated. We studied cross sections of Cs2O-MnO2-P2O5-H2O systems at 150-400 degree C and three initial P : Mn ratios - 5, 7.5, and 10 - and at a constant P : Mn ratio of 15. The reaction of manganese and cesium oxides with melts of polyphosphoric acids at 150-400 degree C leads to the separation of three types of trivalent manganese and cesium condensed double phosphates - Cs2MnH3(P2O7)2, triphosphate CsMnHP3O10, and cyclohexaphosphate Cs3Mn3-(P6O18)2 - in addition to a divalent manganese double cyclotriphosphate CsMnP3O9. The compounds separated were characterized by chemical, x-ray phase analysis, IR spectroscopic, and thermogravimetric methods