Abstract

Lead-free multiferroic ceramics of 0.75Bi1−xErxFeO3–0.25BaTiO3 + 1 mol% MnO2 were synthesized by a conventional ceramic technique, and their structure, piezoelectric, ferroelectric and ferromagnetic properties were investigated. All the ceramics possess a perovskite structure. The crystal structure of the ceramics is transformed from rhombohedral to orthorhombic phase with increasing x. The ceramics with x = 0.125–0.15 exhibit good electric insulation (R = 2.75–2.83 × 1010 Ω cm) and strong ferroelectricity (Pr = 13.4–14.2 µC cm−2). The remanent magnetism Mr and saturated magnetization Ms of the ceramics are greatly improved by 380 and 722 % with increasing x from 0 to 0.15, respectively. The present materials exhibit strong ferroelectricity, considerable improved ferromagnetism and relatively good piezoelectricity, suggesting potential applications in advanced multiferroic devices.

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