Order-disorder phenomena in binary oxides with fluorite-related structures were studied by Raman spectroscopy.Raman spectra of disordered phases show broad bands, defects leading to selection rule breakdown. For well-ordered structures, the scattering active modes observed are those allowed by crystal symmetry. Broadening of Raman peaks occurs when order defects are present: antiphase boundaries, distribution of different cations on equivalent crystallographic positions.
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