Improved ferroelectricity and ferromagnetism of Eu-modified BiFeO3–BaTiO3 lead-free multiferroic ceramics
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Multiferroic ceramics of 0.75Bi1−x Eu x FeO3–0.25BaTiO3 + 1 mol% MnO2 were synthesized by a conventional solid state reaction method and the effects of Eu doping on microstructure, ferroelectric, ferromagnetic and piezoelectric properties of the ceramics were investigated. All the ceramics exhibit a pure perovskite structure without any secondary phases. After the addition of Eu3+ ions, the crystal structure of the ceramics is transformed from rhombohedral to tetragonal phase at x = 0.025. The ferroelectricity and ferromagnetism of the ceramics are improved. For the ceramic with x = 0.025, the optimum remanent polarization of 18.3 μC/cm2 and good piezoelectricity of 82 pC/N are obtained. The saturated magnetization M s and remanent magnetism M r of the ceramics are improved by 165 and 141 % with x increasing from 0 to 0.175, respectively.
KeywordsMnO2 BaTiO3 BiFeO3 Tetragonal Phase Pure BiFeO3
This work was supported by the projects of Education Department of Sichuan Province (15ZA0037, 15ZB0032), and Science and Technology Bureau of Sichuan Province (2014JY0040).
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