The polycrystalline xBi_0.5Na_0.5TiO₃-(1-x)NiFe₂O₄ solid solutions with different ratios have been synthesized by sol-gel method. The samples are respectively annealed with nonmagnetic and magnetic field annealing processes. X-ray diffraction patterns present the pure formation with coexistence of Bi_0.5Na_0.5TiO₃ and NiFe₂O₄ phases. Micrographs measured with scanning electron microscope show the dense surface morphology. Evident enhancement in electric polarization and magnetoelectric coupling coefficient is observed with magnetic field annealing. As the content of Bi_0.5Na_0.5TiO₃ increases, magnetoelectric effect is most prominent at the ratio of x = 0.7 with magnetic field annealing. These results indicate the successful influence on room-temperature magnetoelectric coupling effect by magnetic field annealing.

采用溶胶-凝胶法合成了不同比例的多晶x Bi _0.5 Na _0.5 TiO _3-（1- x）NiFe ₂ O ₄固溶体。样品分别通过非磁性和磁场退火工艺进行退火。X射线衍射图表明Bi _0.5 Na _0.5 TiO ₃和NiFe ₂ O ₄共存的纯净形成。阶段。用扫描电子显微镜测量的显微照片显示出致密的表面形态。通过磁场退火可以观察到极化和磁电耦合系数的明显提高。随着Bi _0.5 Na _0.5 TiO ₃含量的增加，在 磁场退火下，x = 0.7时，磁电效应最为显着。这些结果表明通过磁场退火成功地影响了室温磁电耦合效应。