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2 Podhajska-Kaźmierczak T.

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Phase Equilibria in the Ternary System MgO-Na2O-P2O5. The Partial System Mg2P2O7-Mg6Na8(P2O7)5-NaPO3-Mg(PO)2

Podhajska-Kaźmierczak T.

Polish Journal of Chemistry

2005

Vol. 79 / nr 6

1033-1040

The partial system Mg2P2O7-Mg6Na8(P2O7)5-NaPO3-Mg(PO3)2 in the ternary system MgO-Na2O-P2O5, have been investigated and its phase diagram has been proposed. Investigation was carried out by the differential thermal analysis (heating and cooling), X-ray diffraction methods, and microscopy in reflected light. In the composition range under investigation, five ternary phosphates: Mg6Na8(P2O7)5, Mg2Na3P5O16, MgNa(PO3)3, MgNa2(PO3)4 and MgNa4(PO3)6 appear. Two of them,Mg6Na8(P2O7)5 and MgNa4(PO3)6, congruently melt at 808 and 915°C, respectively, the remaining three melt incongruently. Phosphate Mg2Na3P5O16 melts incongruently at 675°C during heating and decomposes in a few stages. Peritectic melting point of MgNa(PO3)3 phosphate is 942°C, and that of MgNa4(PO3)6 is 785°C. For the composition range of Mg2P2O7-Mg6Na8(P2O7)5- NaPO3-Mg(PO3)2, it has been found that six quasi-binary sections, four ternary peritectics (tP 1 = 660°C, tP 2 =876°C, t P 3 = 578°C, tP 4 = 555°C) and three ternary eutectics (tE 1 = 560°C, tE 2 = 845°C, tE 3 = 540°C) occur.

Phase Equilibria in the Ternary System MgO-Na2O-P2O5. The Partial System Mgo-Na3PO4-Na4P2O7

Podhajska-Kaźmierczak T.

Polish Journal of Chemistry

2003

Vol. 77 / nr 3

295-301

Apartial system of MgO-Na3PO4-Na4P2O7 in the ternary system MgO-Na2O-P2O5 was investigated and its phase diagram was obtained. Thermal analysis (heating and cooling), powder X-ray diffraction, and optical microscopy using reflected light were applied. In the composition range of interest two ternary compounds occur, which melt congruently and have the formulae MgNa4(PO4)2 (m.p. 1655°C) and MgNa6P2O9 (m.p. 1665°C). The phosphates compose a quasi-binary section with continuous solid solutions and exhibit a temperature minimum about 1520°C.