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The polymorphism of CeVO 4  was investigated at high pressures and temperatures in a Belttype high-pressure apparatus. In addition to the normal-pressure modification CeVO 4 — I with zircon-type structure two high-pressure modifications have been found, viz. monazite-type CeVO 4 —II and scheelite-type CeVO 4 —III. CeVO 4 —II is stable between 1 bar and 30 kbar at 1300 °C. Its region of existence decreases rapidly at lower temperatures. From the observed p,T-relations for the I-II and I-III transformations a triple point CeVO 4 —I,II,III at about 27 kbar, 500 °C can be estimated. For kinetic reasons, however, the experimental determination of phase relations becomes difficult at temperatures below 600 °C.

Hochdruckumwandlungen von Cer(III)Orthovanadat(V), CeVO 4 / High-Pressure Transformations of Cerium(III) Orthovanadate(V), CeVO 4