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A new monoclinic phase of cerium orthovanadate, CeVO4(H), was found during the course of oxidation of pseudo-perovskite CeVO3 below 400°C. It has been confirmed to crystallize in the huttonite-type structure (C2h5−P21⁄n), that of LaVO4. The lattice parameters were determined to be: a 0=6.98Å, b0=7.22Å, c0=6.76Å, β=105°02′, V=328Å3 and Z=4. This phase was metastable, and exothermally transformed into a known stable CeVO4 (tetragonal zircon-type, D4h19−I41⁄amd) above 400°C, releasing a small amount of oxygen. From magnetic, chemical and thermogravimetric analyses, the valences of cerium ion and vanadium ion in CeVO4-(H) seem to be tripositive and pentapositive respectively, but V4+ ion is mixed in zircon-type CeVO4; CeVO4(Z).
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Yoshimura et al. (1969) studied this question.
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