Vibrational spectra of rare earth bromate nonahydrate crystals

Polarized Raman spectra of lanthanum and neodymium bromate nonahydrate crystals and IR spectra in a powdered sample have been observed from 30–4000 cm^?1. Observed Raman bands are experimentally classified into three active symmetry species. The vibrational assignment is made by comparing the spectra of these nonahydrates with those of the corresponding nonadeuterates and similar crystals containing various rare earth ions. From a comparison of the Br-O stretching and lattice vibrations, the binding character between the rare earth ions and ligands is discussed. This consideration is consistent with the result supposed from the lanthanide contraction.