Synthesis and Thermal Properties of Co2P2O7 • 6H2O

The dependence of solid phase composition on the main parameters of the interaction in the CoSO4-K4P2O7-H2O system was studied. The synthesis conditions were determined and a crystalline cobalt(II) diphosphate of the composition Co2P2O7 center dot 6H(2)O was synthesized. Its thermal properties were studied. The composition and the intervals, wherein the thermally stable products of partial and complete dehydration of Co2P2O7 center dot 6H(2)O are formed, were specified. The final heat treatment product, anhydrous alpha-Co2P2O7, was identified and a sequence of the solid phase thermal transformations accompanying its formation was established.