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Investigation of Phase Equilibria in the System Nd2O3–Na2O–P2O5. Quasibinary Section NdPO4–Na3PO4

100%

Znamierowska T. , Bandrowski S.

2006

tom Vol. 80, nr 10

1731-1735

Quasibinary section NdPO4–Na3PO4 has been investigated by thermoanalytical methods (DTA, TG, DTG), X-ray powder diffraction and microscopy. Its phase diagram is proposed. It is found, that the parent orthophosphates react in the molar ratio 1:1 yielding an intermediate compound of Na3Nd(PO4)2. This phosphate melts incongruently at 1485C, giving NdPO4 and an Na3PO4-rich liquid. Na3Nd(PO4)2 compound is stable down to room temperature and exhibits a polymorphic transition at about 1040 graduate C.

Investigation of Phase Equilibria in the System Nd2O3–Na2O–P2O5: The Partial System NdPO4–Na3PO4–Na4P2O7

100%

Znamierowska T. , Bandrowski S.

2007

tom Vol. 81, nr 4

485-492

The NdPO4–Na3PO4–Na4P2O7 portion of the oxide Nd2O3–Na2O–P2O5 system was investigated using thermoanalytical, X-ray powder diffraction and light microscopy techniques, and its phase diagram has been proposed. In the composition range of interest one ternary compound occurs, Na3Nd(PO4)2, which melts incongruently at 1485C and exhibits a polymorphic transition at about 1040C. Two subsystems: NdPO4–Na4P2O7 and Na3Nd(PO4)2–Na4P2O7, which are quasi-binary only in the subsolidus regions, i.e. 944C and 967C, respectively, have been found. It has been shown that a ternary peritectic (tP = 967C) and a ternary eutectic (t = 961C) occur in the quasi-ternary NdPO4–Na3PO4–Na4P2O7 system.