Abstract
Polycrystalline samples with general formula Yb 2− x Co x O 3 (0 < x < 0.6), obtained by sol–gel method and analysed by X-ray diffraction, formed solid solutions over all the mentioned range. Co showed a maximum solubility of 30 mol% in Yb 2O 3 sesquioxide. The lattice parameters are found to vary linearly with the composition x. The cationic distribution over the two non-equivalent sites 8b and 24d of the space group Ia−3 is found to be preferentially. Replacing Yb 3+ by Co 3+ introduces slight changes in the atomic coordinates leading to an increase of the mean cation–anion distances. The ability of Raman spectroscopy to detect changes in local co-ordination is utilized. A pseudo-tetrahedral coordination for the Co 3+ in the 24d site was found.
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