Effects of bismuth donor doping on the phase structure and the magnetic and ferroelectric properties of Fe-doped BaTiO3

To compensate for the acceptor dopant Fe³⁺ in Fe-doped BaTiO₃ ceramics, we introduced a donor dopant into these ceramics in order to investigate its effects on their phase structure and on the magnetic and ferroelectric properties. We prepared 5% Fe-doped BaTiO₃ ceramic and used Bi³⁺ as the donor dopant. We found that the formation of the hexagonal phase in Fe-doped BaTiO₃ was suppressed and that the magnetic and the ferroelectric properties of these ceramics were changed by the Bi³⁺ doping. These results indicate that the structural, magnetic and ferroelectric properties of BaTi_0.95Fe_0.05O₃ ceramics can be controlled by Bi³⁺ doping and that a multiferroic property was observed in the Ba_0.98Bi_0.02Ti_0.95Fe_0.05O₃ ceramic.