Abstract

The thermolysis of dihydrogenphosphates with the general formula MnMn1−x Znx(H2PO4)2 · 2H2O (0 < x < 1.00) is studied. Two parallel thermolysis routes are found to yield cyclotetraphosphate solid solution of composition (Mn1−x Znx)2P4O12 (monoclinic space group C 2/c, Z = 4) as the final product. The sequence of physicochemical transformations and structural reorganizations is determined in both routes. Quantitatively, the involvement of the routes is largely determined by the composition of the starting dihydrogenphosphate solid solution. Two mechanisms are discussed for both removal of crystal water and liberation of free phosphoric acid. A scheme of the process is designed.

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