The System MgO─P2O5─H2O at 25°C |
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| Authors: | Paul W Brown Julie Gulick John Dumm |
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| Affiliation: | Department of Materials Science, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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| Abstract: | The phase diagram for the ternary system MgO─P2O5─H2O at 25°C has been constructed. The magnesium phosphates represented are Mg(H2PO4)2· n H2O ( n = 4, 2, 0), MgHPO4·3H2O, and Mg3(PO4)2· m H2O ( m = 8, 22). Because of the large differences in the solubilities of these compounds, the technique which involves plotting the mole fractions of MgO and P2O5 as their 10th roots has been employed. With the exception of MgHPO4·3H2O, the magnesium phosphates are incongruently soluble. Because incongruency is associated with a peritectic-like reaction, the phase Mg2(PO4)3· 8H2O persists metastably for an extended period. |
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