IR spectra of spinel ferrites have two peaks corresponding to vibrational modes of tetrahedral and octahedral bonds. On the other site, IR spectra of spinel aluminates have three peaks. What vibrational modes do those three peaks correspond to?
Dear Adel:
we need to see the spectra. To my knowledge the ratio between crystalline forms for
ferrite spinel and spinel aluminates - are very different. In case of Al-spnel the octahedral form greatly prevails. But in case of Ferritic counterpart the ratio of tetra:octa is almost equal.
Leonid
Thanks Eng. Mohamed for your concern, but the link is not clear for me.
The answer to my question has been found in the paper: P. Tarte, "Infra-red spectra of inorganic aluminates and characteristic vibrational frequencies of AlO4 tetrahedra and AlO6 octahedral" Spectrochimica Acta ,1967, Vol. 23A, pp. 2127 to 2143.
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