The hydrolysis of monetite, CaHPO4, and brushite, CaHPO4,2H2O, in H2O at pH near 7·0 has been reinvestigated. ΔGf° For Ca5OH(PO4)3, Ca8H2(PO4)6,5H2O, and Ca4O(PO4)2 have been calculated to be –1495·5, –2930·5, and –1092·9 kcal mol–1 respectively, in good agreement with values obtained from calculations based on ΔGf° Ca5F(PO4)3. The stability of these phosphates in the system CaO–P2O5–H2O is discussed.
E. J. Duff, J. Chem. Soc. A, 1971, 917 DOI: 10.1039/J19710000917
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