Abstract
The dehydration and condensation reactions taking place during calcination of Zn 0.5Ca 0.5(H 2PO 4) 2 ·2H 2O have been followed by means of thermal analyses under quasiisothermal-isobaric conditions. Isothermal calcination of the starting binary dihydrogen phosphate has been carried out in an electric oven at various temperatures. The reaction products obtained were analysed by chromatography, IR spectroscopy, X-ray diffraction analysis, electron microscopy and atomic absorption spectroscopy. The compositions of the calcination products were determined by extraction with solutions of inorganic compounds and with organic reagents. The effect of water vapour partial pressure has been monitored on the course, rate, and yield of the condensation reactions and on the formation of the main and a further product, the binary cyclotetraphosphate (tetrametaphosphate) c-ZnCaP 4O 12.
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