Dielectric properties of Sb 2O 3-doped BaFe 12O 19 ferrite

Abstract

Dielectric measurements were carried out on specimens with compositions BaO. (6-x) Fe2 O3. x Sb2 O3 with x having values of 0.0, 0.025, 0.1, and 0.3. Sb2 O3 doping increases the dielectric permittivity drastically. Two loss peaks of similar activation energies were observed. The analysis showed that these arose because of the presence of Fe2+ - Fe3+ and Sb3+ - Sb5+ pairs, respectively, in the system. The experimental data could be analyzed satisfactorily in terms of Cole-Cole relaxation formalism. The relaxation distribution parameter α was found to be much larger in the case of Sb3+ - Sb5+ pair than that due to Fe2+ - Fe3+ pair. © 2005 American Institute of Physics.