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.
On the Vibrational Spectra and Structure of FeCrO3 and of the Ilmenite-Type Compounds CoTiO3 and NiTiO3
RICCHIARDI, Gabriele;
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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
