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

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).