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  • 1 Academy of Economics Department of Inorganic Chemistry, Faculty of Engineering and Economics 118/120 Komandorska 53345 Wroclaw Poland
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In the ternary system MgO−Na2O−P2O5, the system Mg2P2O7−NaPO3 has been examined by thermal and X-ray methods and its phase diagram has been determined. The intermediate compound Na3Mg2P5O16 exists in this system. It melts peritectically at 948 K and decomposes to mixtures of sodium-magnesium metaphosphates and magnesium pyrophosphate Mg2P2O7.