通过制备不同体积含量的MnZn铁氧体磁性颗粒与SiO2非磁绝缘颗粒组成的颗粒复合体.测量了不同频率、不同温度下复合磁介质的有效磁导率μ′与组分的关系,并运用Maxwell-Garnett(MGa或MGb)、Bruggeman(Brug) 、Musal(MU)等有效介质近似(EMA)对实验值进行了拟合和分析,探讨了几种理论模型在磁性颗粒复合体系中的可适性.研究表明:不同频率下各有效介质理论曲线与颗粒复合体有效磁导率μ′的拟合情况基本相同.但是MU模型中相变函数Fam的指数参量m表现为与频率f和温度T相关的函数m(f,T),并且可以得到m与频率f的关系:m(f)=m0f-α.由于MnZn铁氧体超顺磁性颗粒的存在,导致了室温和低温77K时有效介质近似理论与实验值存在明显差异.
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