In this article, MgFe_1.92Bi_0.08O₄ ceramics were prepared by the solid-state synthesis method followed by sintering at 1000, 1050, 1100, and 1150 °C. The effects of sintering temperature on structural, electrical, and magnetic properties were systematically investigated. The results showed that by increasing the sintering temperature, the lattice parameter was increased from 8.376 to 8.405 Å, the relative density was improved up to 97.1 %, the average grain size was increased from 1.92 to 4.12 μm, the d.c conductivity was increased from 38.4 to 5.8 MΩ.cm, the saturation magnetization was increased from 15.9 to 20.2 emu/g, and the coercive field was increased from 9.7 to 6.7 Oe. According to Maxwell and Wagner’s two-layer model, the dielectric behavior and AC conductivity of the samples were explained based on the space charge polarization. The sample sintered at 1050 °C revealed the optimum dielectric properties with a 0.016 dielectric loss and a 24.4 dielectric constant at 10 MHz. Further increasing the sintering temperature resulted in increasing the dielectric constant and dielectric loss up to 33.1, 0.156, respectively, due to the increased thermal activation of electron hopping between Fe²⁺ and Fe³⁺ ions.

在本文中，MgFe _1.92 Bi _0.08 O ₄通过固态合成方法制备陶瓷，然后在 1000、1050、1100 和 1150 °C 下烧结。系统地研究了烧结温度对结构、电学和磁学性能的影响。结果表明，通过提高烧结温度，晶格参数从8.376 Å增加到8.405 Å，相对密度提高到97.1 %，平均晶粒尺寸从1.92增加到4.12 μm，直流电导率从38.4增加到 5.8 MΩ.cm，饱和磁化强度从 15.9 增加到 20.2 emu/g，矫顽场从 9.7 增加到 6.7 Oe。根据麦克斯韦和瓦格纳的两层模型，基于空间电荷极化解释了样品的介电行为和交流电导率。在 1050 °C 下烧结的样品显示出最佳介电性能，介电损耗为 0.016，10 MHz 下的介电常数为 24.4。进一步提高烧结温度导致介电常数和介电损耗分别增加至 33.1 和 0.156，这是由于 Fe 之间电子跳跃的热激活增加²⁺和 Fe ³⁺离子。