离子掺杂对W型钡铁氧体电磁特性的影响  

Influence of Ion Doping on Electromagnetic Property of W-type Ba-Ferrite

作　　者：熊征[1] 刘棱[2] 胡辉[2] 张帅[3] 

机构地区：[1]海军蚌埠士官学校一系,安徽蚌埠233012 [2]海军蚌埠士官学校四系,安徽蚌埠233012 [3]海军工程大学舰船工程系,湖北武汉430033

出　　处：《材料科学与工程学报》2013年第5期664-667,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50979110)

摘　　要：研究了六角晶系W型铁氧体Ba（Zn1-x Cox）2Fe16O27中Co2＋离子掺杂量对产物电磁参数的影响。采用溶胶—凝胶自蔓延燃烧法制备了不同Co2＋离子掺杂量的铁氧体产物,利用微波网络矢量分析仪在X波段范围内选取8.2GHz、10.0GHz和12.4GHz三个典型频率对不同产物的动态电磁参数进行了测量和分析。研究表明：铁氧体在各频率下的介电损耗变化是由于随着Co2＋离子含量的增加带来的电偶极子极化和界面极化造成的;铁氧体的磁损耗是由于Co2＋离子含量的增加,W型铁氧体的磁矩从优方向由单轴过渡到平面,磁晶各向异性场的变化导致了其共振频率的变化,从而证明了调整Co2＋离子的含量可以对铁氧体的工作频段加以控制。同时确定了在X波段,当x=0.6~0.8时,Ba（Znx Co2-x）2Fe16O27具有最佳的吸波性能。Effects on the electromagnetic parameters of hexagonal W type ferrite Ba（Znl-xCox）2Fe16 027 doped with Co2＋ ions were researched. Products with different doping contents were prepared by the method of sol-gel self-combustion. The dynamic electromagnetic parameters at the frequency of 8.2 GHz, 10.0 GHz and 12.4 GHz of each product were measured and analyzed by the microwave vector network analyzer. The dielectric loss is due to the electric dipole polarization and interracial polarization brought by the increase of doping content. The magnetic loss is caused by that as the doping content increases, the crystalline anisotropic preferable direction of W type ferrite changes from uniaxiality to plane, and the changes of crystalline anisotropic field cause the changes of the resonance frequency of the ferrite. Thus it is proved that the working frequency range of W type ferrite can be controlled by adjusting the doping content. In X wave band, Ba（Znx Co2 x）2Fe16027 possessed of a optimal microwave absorbing capability when x was equal to 0.6-0.8.

关 键 词：离子掺杂 W型铁氧体 电磁特性 

分 类 号：TQ153.3[化学工程—电化学工业]