Effect of Gd3+ substitution on dielectric properties of nano cobalt ferrite

CoGdxFe2 (-) O-x(4) (x=0.0, 0.1, 0.3. 0.5) nano magnetic ferrite particles were synthesized by chemical co-precipitation method. The variation of dielectric parameters like dielectric constant, dielectric loss, capacitance and resistance for different Gd3+ compositions has been measured at room temperature for frequency dependence in the range of 100 Hz to 10 MHz using impedance analyzer. Results of measurements reveal strong dependence of dielectric parameters on frequency and Gd3+ ion content. Dielectric constant, dielectric loss, capacitance and resistance decrease with increasing frequency for all the CoGdxFe2 (-) O-x(4) compositions. Increase in Gd3+ ion composition in material, increases the values of dielectric constant, dielectric loss and capacitance while decreases the electrical resistance of nano-particles. A qualitative explanation is given for the composition and frequency dependence of dielectric parameters. (C) 2011 Elsevier B.V. All rights reserved.