Reaction of aqueous solutions of either lanthanum or cerium acetate with molybdenum(VI) oxide (MoO3) produces a mixed lanthanide molybdate acetate, Ln(O2CCH3(MoO4) XH2O (Ln= La, Ce) that is an excellent single source precursor for stoichiometric Ln2Mo2O9. The reaction is very sensitive to the radius of the lanthanide metal used: metals with smaller radii (e.g. yttrium, praseodymium or neodymium) produce a hydroxyl molybdate product, M(OH)x(MoO4)1-x, instead of an acetate molybdate. The products were characterized by thermal gravimetric analysis (TGA) and infrared and NMR spectroscopy. The conversion of the products to lanthanide molybdenum oxides will be discussed including the possibility of producing phosphors, La2Mo2O9:Ln3+ by doping lanthanum molybdenum oxides with other lanthanide metals.

Synthesis of lanthanide molybates via reaction of molybdenum(VI) oxide with aqueous acetate salts

256th National Meeting (2018)

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