Phase equilibria in the ternary system MgO-Na2O-P2O5.: The partial system MgO-Mg3(PO4)2-Mg4Na(PO4)3-Na4P2O7

被引：3
作者：
Podhajska-Kazmierczak, T [1 ]
机构：
[1] Wroclaw Univ Econ, Fac Engn & Econ, Dept Inorgan Chem, PL-53345 Wroclaw, Poland
来源：
THERMOCHIMICA ACTA | 2002年 / 385卷 / 1-2期
关键词：
partial systems; binary phosphates; ternary systems;
D O I：
10.1016/S0040-6031(01)00715-8
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The MgO-Mg-3(PO4)(2)-Mg4Na(PO4)(3)-Na4P2O7 subsystem of the ternary system MgO-Na2O-P2O5 was investigated using thermal analysis (heating and cooling), X-ray diffraction techniques and microscopy in reflected light. Three intermediate compounds: Mg4Na(PO4)(3), MgNaPO4 and MgNa4(PO4)(2) occur in the partial system. Mg4Na(PO4)(3) melts incongruently at 1155degreesC, MgNa4(PO4)(2) melts congruently at 1655degreesC, whereas MgNaPO4 exists only in the solid phase and decomposes at 950-960degreesC. A phase diagram for the partial system is proposed. It has been established that the MgNa4(PO4)(2) phosphate forms a binary system with Na4P2O7. A phase diagram of this system has been constructed. It has been found that a ternary peritectic (tp = 1145 +/- 3.0degreesC) and two ternary eutectics (t(E1) = 984 +/- 3.0degreesC, t(E2) = 732 +/- 1.5degreesC) occur in the MgO-Mg-3(PO4)(2)-Mg4Na(PO4)(3)-Na4P2O7 system. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码：163 / 169
页数：7
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