Multiferroic BiFeO₃-based ceramics were synthesized using the rapid liquid-phase sintering method. The rare-earth ion (Sm³⁺, Gd³⁺, Y³⁺) doping causes structural distortion without changing the intrinsic rhombohedral perovskite structure. Raman analysis shows that the effect of doping on E modes is greater than A₁ modes, and the microstructure of FeO₆ octahedron can be regulated by ion doping. A-site trivalent ion doped ceramics exhibit improved magnetism compared with pure BiFeO₃ ceramic, which originated from the suppressed spiral spin structure of Fe ions. The tilt of FeO₆ octahedron as a typical structure instability causes the anomalous change of the imaginary part of permittivity at high frequency, and doped ceramics exhibit natural resonance around 16–17 GHz.

采用快速液相烧结法合成了多铁性BiFeO ₃基陶瓷。稀土离子（Sm ³⁺，Gd ³⁺，Y ³⁺）掺杂会导致结构变形，而不会改变固有的菱面体钙钛矿结构。拉曼分析表明，掺杂对E模式的影响大于A ₁模式，并且FeO ₆八面体的微观结构可以通过离子掺杂来调节。与纯BiFeO ₃陶瓷相比，A位三价离子掺杂陶瓷表现出更好的磁性，这是由于Fe离子的螺旋自旋结构受到抑制。FeO ₆的倾斜 八面体作为典型的结构不稳定性会导致高频下介电常数的虚部发生异常变化，并且掺杂陶瓷在16-17 GHz附近表现出自然共振。