In this study, Mg–Mn–Al ferrite with a chemical composition of Mg_0.8Mn_0.2Al_0.1Fe_1.9O₄ was synthesized via the sol–gel auto-combustion method. The effects of the sintering time and temperature on the magnetic properties and transmission behaviors were investigated in detail. X-ray diffraction (XRD) results revealed that the powders in the as auto-combusted state were in an amorphous state. Moreover, based on the differential thermal analysis (DTA) curve, the calcination temperature was calculated to be ~900 °C. According to the Archimedes equation, the highest density was obtained for the specimen sintered at 1250 °C for 5 h (94% of the theoretical density). In addition, permagraph results revealed the average magnetic properties of the mentioned samples are as follows: H_c = 7.0 Oe and M_s = 1400 G. According to vector network analyzer (VNA) results, the samples with qualified transmission behaviors showed low scattering parameters in a wide range of frequencies.

在本研究中，Mg-Mn-Al 铁氧体的化学成分为 Mg _0.8 Mn _0.2 Al _0.1 Fe _1.9 O ₄是通过溶胶-凝胶自燃法合成的。详细研究了烧结时间和温度对磁性能和传输行为的影响。X 射线衍射 (XRD) 结果表明，处于自燃状态的粉末处于无定形状态。此外，根据差热分析 (DTA) 曲线，计算出的煅烧温度为 ~900 °C。根据阿基米德方程，在 1250 °C 下烧结 5 小时的试样获得最高密度（理论密度的 94%）。此外，permagraph 结果显示上述样品的平均磁性能如下： H _c  = 7.0 Oe 和 M _s = 1400 G。根据矢量网络分析仪 (VNA) 结果，具有合格传输行为的样品在很宽的频率范围内显示出低散射参数。