Electronic absorption spectra of lanthanides in a molten chloride II. Absoiption characteristics of neodymium(III) in various molten chlorides

摘要

Electronic absorption spectra of trivalent neodymium in LiCl-KCl eutectic, NaCl_2CsCl eutectic, CaCl_2, LiCl, CsCl and mixtures of these at various temperatures were measured, and the variation of the absorption bands, ~4G_(5/2), ~2G-(7/2) < - I_(9/2), were carefully analyzed. The dependence of their molar absorptivity, oscillator strength, and the degree of the energy splitting on temperature and melt composition were determined. As a result, it was suggested that the NdCl_6~(3-) complex keeps its octahedral symmetry in the NaCl-2CsCl eutectic, while this symmetry is more distorted in LiCl and CaCb. Based on these data, the chemical status of NdCl_6~(3-) complex in molten chlorides was discussed.