Junaid, Bushiri M; Antony, C J; Abderrahim, Aatiq(Elsevier, February 11, 2008)
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Abstract:
Raman and FTIR spectra of CaFeTi(PO4)3 and CdFeTi(PO4)3 are recorded and analyzed. The observed bands are assigned in terms
of vibrations of TiO6 octahedra and PO4 tetrahedra. The symmetry of TiO6 octrahedra and PO4 tetrahedra is lowered from their free ion
symmetry. The presence of Fe3+ ion disrupts the Ti–O–P–O–Ti chain and leads to the distortion of TiO6 octrahedra and PO4 tetrahedra.
The PO4 3 tetrahedra in both crystals are linearly distorted. The covalency bonding factor of PO4 3 polyanion of both the crystals are
calculated from the Raman spectra and compared to that of other Nasicon-type systems. The numerical values of covalency bonding
factor indicates that there is a reduction in redox energy and cell voltage and is attributed to strong covalency of PO4 3 polyanionin
Description:
Journal of Physics and Chemistry of Solids 69 (2008) 1985–1989