Ba_0.8Sr_0.2TiO₃ (BST) and Cu_0.5Co_0.5Fe₂O₄ (CCFO) nanopowders were prepared by hydrothermal method and chemical coprecipitation, respectively. Barium strontium titanate nanopowder–nano mixed oxides containing copper, cobalt, and iron (BST-CCFO) multiferroic fluids with different mass ratios (m_BST/m_CCFO = 1:2, 1:1, and 2:1) were prepared by using dimethyl silicone oil and silane coupling agent. Effect of mass ratio on the magnetoelectric performance was comparatively investigated. X-ray diffraction (XRD) showed that the BST and CCFO powders had no secondary phases, which are tetragonal perovskite structure and cubic spinel structure, respectively. Scanning electron microscopy (SEM) showed that the average grain size of BST and CCFO was 26.34 nm and 26.82 nm, respectively. The agglomeration of BST nanopowder was serious. Under the external magnetic field, the BST-CCFO multiferroic fluid will form a chain structure due to the directional movement of magnetic particles, thus enhancing the dielectric properties and ferroelectric properties of multiferroic fluid. The chain structure under the action of magnetic field will change the motion of ferroelectric particles, so that the magnetoelectric coupling effect of multiferroic fluid is significantly enhanced, which is much higher than that of the same type of magnetoelectric composite ceramics. This study is expected to provide a new way to improve the magnetoelectric coupling effect of multiferroic materials.

分别采用水热法和化学共沉淀法制备了Ba _0.8 Sr _0.2 TiO ₃ (BST)和Cu _0.5 Co _0.5 Fe ₂ O ₄ (CCFO)纳米粉体。钛酸锶钡纳米粉体-含铜、钴和铁的纳米混合氧化物 (BST-CCFO) 具有不同质量比 ( m _BST / m _CCFO ) 的多铁性流体 = 1:2、1:1 和 2:1) 使用二甲基硅油和硅烷偶联剂制备。比较研究了质量比对磁电性能的影响。X 射线衍射 (XRD) 表明 BST 和 CCFO 粉末没有第二相，分别为四方钙钛矿结构和立方尖晶石结构。扫描电子显微镜 (SEM) 显示 BST 和 CCFO 的平均晶粒尺寸分别为 26.34 nm 和 26.82 nm。BST纳米粉体团聚严重。在外磁场作用下，BST-CCFO多铁性流体会因磁性粒子的定向运动而形成链状结构，从而增强多铁性流体的介电性能和铁电性能。磁场作用下的链状结构会改变铁电粒子的运动，使多铁性流体的磁电耦合效应显着增强，远高于同类型磁电复合陶瓷。该研究有望为提高多铁性材料的磁电耦合效应提供一种新的途径。