The XRD patterns and the IR and Raman spectra of fine powders of the corundum-type sesquioxides alpha-Fe2O3 and alpha-Cr2O3, of the ilmenite-type mixed oxides NiTiO3 and CoTiO3 and of the mixed oxide alpha-FeCrO3 is obtained from the XRD pattern, the IR and Raman spectra provide evidence for the centrosymmetric ilmenite-type superstructure in the case of alpha-FeCrO3. The noncentrosymmetric alternative superstructure (LiNbO3-like) is excluded by the validity of the mutual exclusion rule. (C) 1994 Academic Press, Inc.
On the Vibrational-spectra and Structure of FeCrO3 and of the Ilmenite-type Compounds CoTiO3 and NiTiO3
BUSCA, GUIDO;
1994-01-01
Abstract
The XRD patterns and the IR and Raman spectra of fine powders of the corundum-type sesquioxides alpha-Fe2O3 and alpha-Cr2O3, of the ilmenite-type mixed oxides NiTiO3 and CoTiO3 and of the mixed oxide alpha-FeCrO3 is obtained from the XRD pattern, the IR and Raman spectra provide evidence for the centrosymmetric ilmenite-type superstructure in the case of alpha-FeCrO3. The noncentrosymmetric alternative superstructure (LiNbO3-like) is excluded by the validity of the mutual exclusion rule. (C) 1994 Academic Press, Inc.
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