Abstract
Abstract Calcination of a mixture of copper (II) oxide and phosphoric acid (mol. ratio CuO/P2O5 = 1) produces dicopper (II) cyclo-tetraphosphate as the main product. At first, various intermediates of the type of simple copper (II) phosphates are formed. Then, at higher temperatures, condensation of phosphate anions takes place. Temperature and rate of the individual reactions as well as yields of the main product are distinctly affected by water vapour pressure in the calcinate.
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