Spectroscopic study of trivalent rare earth ions in calcium nitrate hydrate melt

Add time:09/26/2019    Source:sciencedirect.com

Influence of the water content to chemical status of trivalent rare earth ions in calcium nitrate hydrate melt was studied by spectroscopic techniques. Fluorescence spectrometry for Eu(III) in Ca(NO3)2·RH2O and electronic absorption spectrometry for Nd(III) in Ca(NO3)2·RH2O were performed for analyzing the changing coordination symmetries through the changes in their hypersensitive transitions. Raman spectroscopic study and EXAFS study were performed for Y(NO3)3 solutions and Y(III) in Ca(NO3)2·RH2O for analyzing the oxygen bonding to Y(III). Luminescence lifetime study of Eu(III) and Dy(III) in Ca(NO3)2·RH2O was performed for evaluating the hydration number changes. Results of these spectroscopic studies indicated that, with the decrease of water content (R), the hydration number decreases while the interaction between trivalent rare earth ion and nitrate ion increases. It was also revealed that the symmetry of the coordination sphere gets distorted gradually by this interaction.

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