Raman light scattering and photoluminescence of ceria based ytterbium derivative
Shkerin S. N.1, Gyrdasovа O. I.2, Abdurkhimova R. K.1, Tkachuk А.V.1, Abasovа К. V.1
1Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2Institute of Solid State Chemistry, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
Email: shkerin@mail.ru
Thermolysis of formate precursor complexes in air has produced a number of derivatives of Ce(Yb)O2, and for selected compositions and Ce(Y)O2. All samples are characterized by a face-centered cubic structure (Fm-3m), of the fluorite type. Raman spectroscopy studies using two different sources (785 and 532 nm) made it possible to isolate structural lines and photoluminescence lines, since the structural lines do not depend on the wavelength of the radiation used. Photoluminescence is observed both from the ytterbium cation and from the intrinsic defects of the oxide lattice - anionic vacancies. A change in the local structure from fluorite to pyrochlore has been traced, it occurs in the region of 9 % of the doping cation and manifests itself not only in a change in the set of structural lines, but also in a change in the frequency of luminescence of the ytterbium cation: 2375(1) cm-1 for the fluorite structure at low concentrations of the additive and 2440(2) cm-1 for the pyrochlore structure. The latter value agrees well for derivatives based on zirconium dioxide, which also have a pyrochlore structure. Keywords: derivatives, Raman scattering of light, structural lines, ratio of fluorite/pyrochlor structures.
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