Effect of Indium substitution on Structural and Hyperfine parameters of CoFe2O4.

Structural and ⁵⁷Fe MÖssbauer study of Sol-Gel prepared Indium substituted Cobalt ferrites with chemical formula CoFe_2-xIn_xO₄ (x= 0, 0.2, 0.4, 0.6 and 0.8) are reported in this paper. From the Rietveld refinement of X-Ray diffraction patterns, it is observed that x=0, 0.2 samples are formed in single phase without any detectable impurity and x=0.4, 0.6 and 0.8 samples consists of a relatively small fraction un-reacted Fe₂O₃ as an impurity phase. It is also found that lattice parameters increase with the increase of Indium concentration. The SEM images exhibit the increase of grain size from 100-205 nm with the increase of Indium doping concentration. Room temperature ⁵⁷Fe Mossbauer spectroscopy confirms the magnetic ordering of Fe³⁺ spins in all the samples. [ABSTRACT FROM AUTHOR]