Optical Properties of Gd3+ Substituted CoFe2O4Nanoparticles.

Abstract.CoGd_xFe_2-xO₄ nanoparticles with x = 0.0, 0.03, 0.05, 0.07, 0.10 and 0.15 were prepared by co-precipitation route. The effect of Gd³⁺replacement over Fe³⁺on optical properties of CoFe₂O₄nanoparticles has been analyzed. X-ray diffraction analysis confirmed single phase formation with spinel structure and lattice parameter reduced with increasing Gd³⁺ concentration.Optical band gap measurements suggested that band gap valuedecreasesfrom 1.11 to 0.93 eV with Gd³⁺ substitution, however, the emitting centers in photoluminescence spectra are same for undoped and Gd³⁺ doped samples. [ABSTRACT FROM AUTHOR]