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Phase Equilibria in the YPO4 -- Ba3(PO4)2 System

Szuszkiewicz W., Radomińska E., Znamierowska T.

Polish Journal of Chemistry

2002

Vol. 76 / nr 1

23-27

The binary system YPO4 -- Ba3(PO4)2 has been examined by differential thermal analysis, X-ray and microscopy in reflected light. Its phase diagram has been proposed. The initial orthophosphates react at a 1:1 and 2:1 molar ratio to give two intermediate compounds: Ba3Y(PO4)3 and Ba3Y2(PO4)4. It has been established that Ba3Y(PO4)3 melts congruently at 1950 š 20°C. Ba3Y2(PO4)4 melts incongruently at 1800 _ 20_C and is stable at high temperature only; it decomposes into YPO4 and Ba3Y(PO4)3 at about 1150_C. Double orthophosphate, Ba3Y(PO4)3, has a cubic unit cell (eulytite structure) with the parameter a = 10.4655 A.

Phadse Equilibria in the System CePO4-Ba3(PO4)2

Szuszkiewicz W., Radomińska E., Znamierowska T., Wilk P.

Polish Journal of Chemistry

2002

Vol. 76 / nr 8

1095-1100

Based on thermal investigation and X-ray powder diffraction the unknown so far phase diagram of the binary system CePO4-Ba3(PO4)2 has been elaborated. It contains an intermediate compound Ba3Ce(PO4)3, which congruently melts at about 2080 degree centigrade, is stable down to room temperature and has an eulytite structure. In the composition range given by the molar ratio of CePO4:Ba3(PO4)2 from 1:1 to 1:6 there exist solid solutions of the eulytite structure. At high temperatures there exist two binary eutectics (te1 = 1840 degree centigrade, te2 = 1600 degree centigrade).

Phase equilibria in a portion of the system La2O3-BaO-P2O5 rich in P2O5

Znamierowska T., Radomińska E.

Polish Journal of Chemistry

1999

vol. 73 nr 4

593-597

The system LaPO4-Ba(PO3)2-LaP5O14, a part of the La2O3-BaO-P2O5 oxide system, has been investigated by differential thermal analysis, X-ray powder diffraction and microscopy in reflected light and its phase diagram was suggested. It was found that in the composition range under investigation, there occurs the quasi-binary section, i.e. La(PO3)3-Ba(PO3)2 only. Its phase diagram has been determined.