Infrared And Mossbauer Investigations Of Cdgaxfe2-Xo4 Spinels

The Cd-Ga ferrite system CdGaxFe2-xO4 (where x = 0, 0.6 and 1.0) was studied by means of infrared (IR) and Mossbauer spectroscopy. IR spectra revealed two prominent bands nu (1) and nu (2) which were assigned to tetrahedral and octahedral metal complexes, respectively. The position of the highest frequency band nu (1) showed an increase with increasing gallium concentration. The lowest band nu (2) was broadened and diffused with gallium substitution. Mossbauer spectra at room temperature exhibited paramagnetic doublet lines. As a result of distortion in the oxygen positions surrounding the B-sites, the quadrupole interaction in the Mossbauer spectra increased with increasing gallium concentration. IR and Mossbauer spectra revealed the absence of Fe2+ ions at both tetrahedral and octahedral sites.