摘要
采用固相反应方法制备了Ba2Zn1.6-xCoxCu0.4Fe12O22(x=0,0.2,0.4,0.6)铁氧体粉末,将粉末在1050℃下退火4小时。利用X射线衍射(XRD)、振动样品磁强计(VSM)以及矢量网络分析仪研究了退火样品的晶体结构及其在8.2～12.5GHz波段的微波吸收特性。XRD分析表明样品为Y型六角铁氧体。VSM及微波矢量网络测量表明,掺Co样品的介电常数实部ε′的平均值由不掺时的6.5降为5.0。随着Co替代量的增加,样品的饱和磁化强度和剩磁不断增大;矫顽力先维持在62～70Oe之间,至Co含量x=0.6时迅速增为315.5Oe。在磁导率虚部μ″谱中观察到样品的自然共振吸收峰,其共振频率和峰值与样品中的Co含量有关,Co含量x=0.2的样品的μ″峰值达6.579,相应的反射功率损耗达41.796dB,吸波性能良好,基本达到在共振频率附近提高μ′、μ″和ε″值,同时降低ε′值的目的。
Ba_2Zn_（1.6-x）Co_xCu_（0.4）Fe_（12）O_（22）（x= 0,0.2,0.4,0.6） Y-type hexagonal ferrite powders prepared by the solid-state reaction method were sintered at 1050℃.The crystal structures and microwave absorption properties of the samples have been investigated by X-ray diffractometry（XRD）,vibrating sample magnetometry（VSM） and a vector network analyzer.XRD results confirm that all samples are well-defined Y-type phase.Experimental results show that the substitution of Co for Zn leads the average value of ε′ to decrease from 6.5 to 5.0.Co substitution will increase the saturation magnetization and remanence of the samples.As Co content rises,the coercivities maintain onto 62～70Oe for x0.6 and increase rapidly to （315.5Oe） when x=0.6.The natural resonance peaks are observed on the μ″ spectra of the samples,the resonance frequencies and peak values are dependent on Co content.The sample with Co content x=0.2 displays good absorbing properties,for instance,the maximum μ″ exceeds 6.579,and the corresponding reflection power loss reaches to 41.796dB,and μ′,μ″ and ε″ increase while ε′ decreases around the resonance frequency.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2010年第6期871-875,共5页
Journal of Materials Science and Engineering
基金
江苏省高校自然科学研究计划资助项目(06KJD430014)
关键词
Y型六角铁氧体
Co替代
磁导率
微波吸收特性
Y-type hexagonal ferrite
Co substitution
permeability
microwave absorption property
