Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
Abstract:
The dielectric properties of a 2.5 mol% Bi2O3 doped Ba-ferrite (BaFe12O19) have been investigated. The specimen shows a drastically enhanced (≈ 105 times) permittivity (ε) through local polarization of Fe3+ electronic charges activated with nearby Bi3+ sites. The ε value also depends reasonably on thermal annealing (causes grain growth) of the samples. The specimens comprising large particle sizes (1–20 μ m) usually exhibit smaller ε values and low dielectric losses.