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study of Phase Equilibria in the System Nd2O3-Na2O-P2O5. The Quasi-Binary Section Nd(PO3)3-NaPO3

Znamierowska T., Bandrowski Sz.

Polish Journal of Chemistry

2003

Vol. 77 / nr 9

1131-1134

The quasi-binary section Nd(PO3)3-NaPO3 has been investigated by thermoanalytical methods (DTA, TG, DTG) and X-ray powder diffraction and its phase diagram was proposed. It was found that initial metaphosphates react at a 1:1 molar ratio, forming the intermediate compound NaNd(PO3)4. It was confirmed, that it melts incongruently at about 866_C, giving Nd(PO3)3 and a liquid rich in NaPO3. The phosphate NaNd(PO3)4 is stable to room temperature and does not exhibit polymorphic transitions.