Yttrium(III) and lanthanide(III) vanadates corresponding to the general formula AVO 4 (A = Y, Pr, Sm, Eu, Gd, Dy, Er) were prepared by a nonconventional soft chemistry route in which coordination compounds of the different elements to be incorporated were used as molecular precursors. In this case, EDTA-based yttrium(III), lanthanide(III) and vanadium(V) complexes were synthesised, characterised and used as precursors for the preparation of zircon-type AVO 4 materi-

Lanthanoids I 2800Yttrium, Lanthanide and Mixed Y-Ln Vanadates Prepared from Molecular Precursors Based on EDTA. -The compounds LnVO 4 (Ln: Y, Pr, Sm, Eu, Gd, Dy, Er) are synthesized by evaporation of aqueous solutions of (NH4)[Ln(edta)]·nH2O and (NH4)3[V(O)2(edta)]·0.5H2O followed by calcination at 800°C for 6 h. Solid solutions such as Y1-xPrxVO4 and Y1-xGdxVO4 are also obtained. The samples are characterized by powder XRD, SEM, TGA, and Raman spectroscopy. -(DELIGNE, N.; GONZE, V.; BAYOT, D.; DEVILLERS*, M.; Eur.