In this work, the synthesis results are reported, and the structural, electrical and magnetic properties of orthorhombic (Pbam) structured bulk Bi₂Fe₄O₉ synthesized through the solid-state reaction process have been studied. Bi₂Fe₄O₉ has been investigated using several ecperimental techniques, such as X-ray diffraction, scanning electron microscopy, Raman spectroscopy, dielectric as well as magnetometry. The Rietveld refined X-ray diffraction data and Raman spectroscopy results clearly revealed the formation of Bi₂Fe₄O₉ perovskite structure and all the peaks of Bi₂Fe₄O₉ perfectly indexed with the orthorhombic (Pbam) structure. It has been established that the Raman spectrum identified A_g, B_2g, and B_3g active optical phonon modes, and the Raman peak at 470 cm⁻¹ possibly have a magnetic origin. As a result, the coexistence of weak ferromagnetic and antiferromagnetic orders in Bi₂Fe₄O₉ ceramic was established. The remnant magnetization (2M_r) and coercivity (2H_c) are 8.74 × 10⁻⁴ emu/g and 478.8 Oe, respectively. We report the significant multifarroic effects in polycrystalline Bi₂Fe₄O₉ ceramics. These characteristics make this material very useful in technological and practical applications.

在这项工作中，报道了合成结果，并且研究了通过固态反应过程合成的正交晶（Pbam）结构的块状Bi ₂ Fe ₄ O ₉的结构，电学和磁性。Bi ₂ Fe ₄ O ₉已使用多种实验技术进行了研究，例如X射线衍射，扫描电子显微镜，拉曼光谱，介电以及磁强法。进行Rietveld精X射线衍射数据和拉曼光谱的结果清楚地揭示了Bi的形成₂的Fe ₄ ø ₉钙钛矿结构和Bi的所有峰₂Fe ₄ O ₉具有正交晶（Pbam）结构的完美索引。已经确定拉曼光谱识别出A _g，B _2g和B _3g有源光学声子模式，并且在470 cm ^-1处的拉曼峰可能具有磁性。结果，建立了Bi ₂ Fe ₄ O ₉陶瓷中弱铁磁序和反铁磁序的共存。剩余磁化强度（2 M _r）和矫顽力（2 H _c）为8.74×10 ^-4emu / g和478.8 Oe。我们报告了多晶Bi ₂ Fe ₄ O ₉陶瓷中显着的多铁电效应。这些特性使这种材料在技术和实际应用中非常有用。