VIBRATIONAL SPECTROSCOPIC CHARACTERIZATION OF LANTHANIDE MOLYBDATES

The vibrational spectrum of lanthanide molybdates (materials with impo rtant optical, electrical and catalytic properties) was assigned by us ing sites symmetry and factor group analysis. Raman and infrared spect ra were registered and the modes corresponding to the MoO42- and LnO(n ) polyhedra were specified. An interesting behaviour for the symmetric stretching mode of the molybdate ion was found in these condensed lat tices. The lanthanide cation does not influence the MoO42- vibrational behaviour. The use of this spectroscopy to characterize these materia ls is thus shown.