ions coupled by exchange interaction in a distorted octahedral environment. The EPR spectra at different temperatures (123-295 K) have also been studied. The intensity of the resonance signals decreases with increase in temperature whereas linewidth is found to be independent of temperature. The paramagnetic susceptibility (w) was calculated from the EPR data at various temperatures and the Curie constant (C) and paramagnetic Curie temperature (y p ) have been evaluated from the 1/w versus T graph. The optical absorption spectrum exhibits bands characteristic of Fe 3 + ions in octahedral symmetry. The crystal field parameter (Dq) and the Racah interelectronic repulsion parameters (B and C) have also been evaluated and discussed.

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