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采用聚丙烯酰胺凝胶法制备了尖晶石型纳米晶Ni0.4CoxZn0.6-xFe2O4(x=0、0.2、0.4),同时考察了铁氧体的电磁性能.由X射线衍射(XRD)可知,随着x的增大,Ni0.4CoxZn0.6-xFe2O4的晶格常数从0.838 4 nm减小到0.835 7 nm.透射电镜(TEM)结果表明,Ni0.4Zn0.6Fe2O4铁氧体粒子的平均直径约为20 nm.Ni0.4CoxZn0.6-xFe2O4在8.2~12.4 GHz的测试频率范围内具有介电损耗和磁损耗.在频率为9.0 GHz时,Ni0.4CoxZn0.6-xFe2O4(x=0.4)复介电常数虚部的最大值达到19.6.随着x值的增加,复数磁导率虚部的共振吸收峰向高频移动.制备的复合物可以被广泛地用于抑制电磁辐射和吸收雷达波等领域.
The spinel nanocrystalline Ni0.4CoxZn0.6-xFe2O4 (x = 0,0.2,0.4) was prepared by polyacrylamide gel method, and the electromagnetic properties of the ferrite were also investigated. It can be seen by X-ray diffraction , With the increase of x, the lattice constant of Ni0.4CoxZn0.6-xFe2O4 decreased from 0.838 4 nm to 0.835 7 nm.The results of transmission electron microscopy (TEM) showed that the average diameter of Ni0.4Zn0.6Fe2O4 ferrite particles Is about 20 nm.Ni0.4CoxZn0.6-xFe2O4 has dielectric loss and magnetic loss in the frequency range of 8.2 ~ 12.4 GHz.At the frequency of 9.0 GHz, Ni0.4CoxZn0.6-xFe2O4 (x = 0.4) complex The maximum value of the imaginary part of the dielectric constant reaches 19.6. As the value of x increases, the resonance absorption peak of the imaginary part of the complex permeability moves to a high frequency. The prepared composite can be widely used for suppressing electromagnetic radiation and absorbing radar waves Other fields.