MnZn铁氧体的制备及其吸波性能研究

The Preparation and Absorbing Properties of MnZn Ferrite

采用氧化物陶瓷工艺制备高磁导率MnZn铁氧体,以Mn3O4、Fe2O3和ZnO为原料,对ZnO过量对铁氧体的磁性能的影响进行了深入研究,确定了最佳配方,并测试了该铁氧体在微波频率下的电磁参数,模拟分析了该粉体的吸波性能。结果表明,当三种氧化物的摩尔比n（Fe2O3）∶n（Mn3O4）∶n（ZnO）为52.8∶24.2∶24时制得的MnZn铁氧体磁性能最佳,频率为200 KHz时,磁导率为19.5;模拟厚度4 mm时,有两个吸收峰分别为（3.38 GHz,-7.96 dB）和（18 GHz,-5.53dB）,在（28.48）GHz和（16.9818）GHz频率范围内,反射率R小于-2 dB,说明MnZn铁氧体在整个微波频段（2-18）GHz有一定的吸波性能。

High permeability MnZn ferrite was prepared by the oxide ceramics method with Mn3O4, Fe2O3 and ZnO as raw materials. The best formula was based on study of influence on ZnO overdose of ferrite magnetic. Then, electromagnetic parameters of the ferrite under microwave frequency were tested. Finally, the absorbing performance of the powder was analyzed by simulating. The results show that when the molar ratio of three kinds of oxide n（Fe2O3） ∶ n（Mn3O4） ∶ n（ZnO） is 52.8 24.2 ∶ 24, magnetic properties of MnZn ferrite is the best. When the frequency is 200 KHZ, permeability is 19.5. Two absorption peaks are（3.38 GHz,-7.96 dB） and（18 GHz,-5.53 dB） respectively with simulated thickness of 4 mm. The reflectance R is less than-2 dB in（2 -8.48） GHz and（16.98 18） GHz frequency range which explains MnZn ferrite has certain wave absorption performance in the microwave frequencies（2 -18） GHz.