Dielectric properties of Sb_2O_3-doped BaFe_(12)O_(19) ferrite

摘要

Dielectric measurements were carried out on specimens with compositions BaO.(6-x)Fe_2O_3.x Sb_2O_3 with x having values of 0.0, 0.025, 0.1, and 0.3. Sb_2O_3 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 Fe~(2+)-Fe~(3+) and Sb~(3+)-Sb~(5+) 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 Sb~(3+)-Sb~(5+) pair than that due to Fe~(2+)-Fe~(3+) pair.