Abstract A lead–free multiferroic ceramic 0.7BiFeO 3 –0.3BaTiO 3 showed strong ferroelectric and piezoelectric properties, but weak magnetic and magnetoelectric properties. We herein expected that the electrical and magnetic properties of 0.7BiFeO 3 –0.3BaTiO 3 ceramics could be enhanced by introducing LaFeO 3 . (0.7– x ) BiFeO 3 –0.3BaTiO 3 – x LaFeO 3 ( x = 0–0.2) were synthesized by solid-state reaction. All the ceramics formed a perovskite structure, and a morphotropic phase boundary (MPB) between rhombohedral and orthorhombic phases formed at x = 0.025. The ceramics with MPB composition had high unipolar strain ( S max = 0.14%), piezoelectricity ( d 33 = 223 pC/N, d 33 * = 350 pm/V), ferroelectricity ( P r = 25.67 mC/cm 2 ) and magnetoelectricity ( a ME = 466.6 mV/cm·Oe), which can be attributed to addition of La ions. The improved phase angle also demonstrated augmentation of ferroelectricity on the microscopic view. The ferromagnetism was evidently improved after LaFeO 3 doping, and the remanent magnetization M r increased from 0.0207 to 0.0622 emu/g with rising x from 0 to 0.075. In conclusion, with strong magnetoelectric properties, the prepared ceramics may be applicable as promising lead–free multiferroic ceramic materials for novel electronic devices.

中文翻译：

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多铁性 BiFeO3–BaTiO3–LaFeO3 陶瓷的增强铁电、磁性和磁电性能

摘要 无铅多铁性陶瓷0.7BiFeO 3 –0.3BaTiO 3 表现出较强的铁电和压电性能，但具有弱磁和磁电性能。我们在此预期通过引入 LaFeO 3 可以提高 0.7BiFeO 3 –0.3BaTiO 3 陶瓷的电学和磁学性能。(0.7– x ) BiFeO 3 –0.3BaTiO 3 – x LaFeO 3 ( x = 0–0.2) 通过固态反应合成。所有陶瓷都形成钙钛矿结构，并且在 x = 0.025 处形成菱形相和正交相之间的同形相界 (MPB)。MPB 组成的陶瓷具有高单极应变 (S max = 0.14%)、压电性 (d 33 = 223 pC/N, d 33 * = 350 pm/V)、铁电性 (P r = 25.67 mC/cm 2 ) 和磁电性(a ME = 466.6 mV/cm·Oe)，这可归因于添加了 La 离子。改进的相位角还证明了微观视图中铁电性的增强。LaFeO 3 掺杂后铁磁性明显改善，剩磁M r 从0.0207增加到0.0622 emu/g，x从0增加到0.075。总之，所制备的陶瓷具有强磁电性能，可用作新型电子器件的有前途的无铅多铁性陶瓷材料。