Abstract
AbstractRaman spectra of rare earth (REE: rare earth elements) trichloride (REE = Y, La, Ce, Pr, Sm, Gd, Dy, or Yb) dissolved in alkali chloride eutectic melts (LiCl‐KCl, LiCl‐RbCl, and LiCl‐CsCl) were measured at 793 K. The spectra showed polarized peaks centered around 240–270 cm–1, which were identified as the totally symmetric stretching vibration (ν1) of the octahedral REECl63–. The ν1 frequency increased with the polarizing power of the trivalent REE ions. The change in the ν1 frequency was found to be larger for lighter lanthanides. This was attributable to the distortion of the Oh symmetry of REECl63–.
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