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Phase Equilibria in the Ternary System Nd2O3-K2O-P2O5. The partial system NdPO4-KPO3-Nd(PO3)3

Znamierowska T., Mizer D.

Polish Journal of Chemistry

2004

Vol. 78 / nr 2

195-200

In the ternary system Nd2O3-K2O-P2O5 a partial system NdPO4-KPO3-Nd(PO3)3 was investigated by thermoanalytical methods, X-ray powder diffraction and microscopy in reflected light and its phase diagram was proposed. In the system a double metaphosphate KNd(PO3)4 appears. The compound forms in a side system Nd(PO3)3-KPO3. It has been established that the KNd(PO3)4 and NdPO4 form a section, which is a real system only in the subsolidus region. It is found, that a ternary peritectic (tP ~ 885°C) and a ternary eutectic (tE ~ 688°C) occur in the partial system NdPO4-KPO3-Nd(PO3)3.