Luminescence probing of structural transformations of yttrium acid oxalate trihydrate
- Institute of Telecommunications and Electronics (Russian Federation)
The structural transformations of yttrium acid oxalate trihydrate YH{sub 5}O{sub 2}(C{sub 2}O{sub 4}){sub 2}{center_dot}H{sub 2}O in the 77-350{degrees}K temperature range have been investigated with the aid of a luminescent probe in the form of an admixture of 5-15% Eu{sup 3+} ions replacing Y{sup 3+} ions. The vibronic luminescence (the {sup 5}D{sub 0}-{sup 7}F{sub 0-4} transitions) and excitation (the {sup 7}F{sub 0}-{sup 5}D{sub 0} transition) spectra of Eu{sup 3+}, as well as the IR absorption spectra, have ben studied. The temperature dependence of the crystal-field parameters has been spectra, have been studied. The temperature dependence of the crystal-field parameters has been examined. Deuteration has been employed to identify the bands of the librational and translations vibrations of the proton-containing groups. The anisotropic mobility of the proton-containing groups detected in the PMR spectra in the vicinity of 118 K as the samples are heated is manifested in the vibronic and IR spectra as smooth broadening and displacement of the bonds of the librational and translational vibrations of these groups to lower frequencies. The phase transition at 328 K is manifested in the luminescence spectra as an abrupt increase in the symmetry of the crystal field: the second-order axis is transformed into a fourth-order axis.
- OSTI ID:
- 35652
- Journal Information:
- Russian Journal of Coordination Chemistry, Journal Name: Russian Journal of Coordination Chemistry Journal Issue: 8 Vol. 19; ISSN RJCCEY
- Country of Publication:
- United States
- Language:
- English
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