RAMAN-SPECTRA OF MOLTEN GDCL3-KCL AND GDCL3-NACL

The complex anions and their vibrational modes in molten GdCl3-KCl and GdCl3-NaCl were examined by Raman spectroscopy. Each spectrum was deconvoluted into two or three peaks with the Lorentzian-type functions. The peaks in the spectra were assigned to three Raman active modes (nu1, nu2, nu5) of the GdCl63- octahedral complex anion. These peaks shifted toward the lower wavenumber region with increasing mole fraction of GdCl3. The peak of nu5 mode was observed only in the low GdCl3 concentration region. The clustering of complex anion GdCl63- appeared to exist in the melts. However, the clustering might be restrained when the GdCl3 concentration became relatively low by adding KCl or NaCl.