中文摘要：

用固相反应法制备了Ti^4＋、Zn^2＋取代的Co2Z（Ba3Co2Fe24-xMO41,M=Ti、Zn,x=0.2～0.6）平面六角结构软磁铁氧体并对其电磁特性进行了研究。X-射线衍射结果表明样品表现出典型的Z型平面六角铁氧体构型。Ti^4＋、Zn^2＋取代会增加铁氧体内载流子的浓度,从而影响Co2Z的电磁性能。实验中用4991A阻抗/材料分析仪测试室温条件下Ba3Co2Fe24-xTixO41（x=0、0.2、0.4）和Ba3Co2Fe24-xZnxO41（x=0、0.2、0.4、0.6）样品在5MHz～1GHz范围内的磁导率频谱和介电常数频谱。实验结果表明,Ti4＋取代Fe3＋会增加Co2Z的起始磁导率,降低Co2Z的介电共振。而Zn^2＋取代Fe^3＋会引起起始磁导率的下降,增加Co2Z的介电共振,且在共振频率附近介电常数为负值。CoZ的负介电常数特性使它可作为负介电常数介质用于左手材料的制备。

英文摘要：

The magnetic and dielectric properties of Ti^4＋-substituted and Zn^2＋-substituted Co2Z（Ba3Co2Fe24-xMO41,M=Ti,Zn,x=0.2～0.6） hexagonal ferrites that were prepared using the solid state reaction method were investigated in this paper.X-ray diffraction results showed that the products obtained were typical hexagonal ferrite.Ti^4＋、Zn^2＋ substitution would increase the charge carriers in the ferrite,then influenced the magnetic and dielectric properties of the samples.The frequency spectrums of the permeability and permittivity of Ba3Co2Fe24-xTixO41（x=0,0.2、0.4）and Ba3Co2Fe24-xZnxO41（x=0,0.2、0.4、0.6） were measured using an Agilent 4991A impedance/material analyzer from 5 MHz to 1 GHz at room temperature.The experimental results showed that the initial permeability of Co2Z would be increased when Ti4＋ substituted Fe3＋ and the dielectric resonance of Co2Z would be decreased.However,the initial permeability of Co2Z would be decreased when Zn^2＋ substituted Fe^3＋ and the dielectric resonance of Co2Z would be increased.In the vicinity of the dielectric resonant frequency,the dielectric constant of Co2Z turned to be negative.The feature showed that Co2Z could serve as the negative dielectric medium in constructing the left-handed materials.