Abstract Experimental results of the complex magnetic permeability (µ) and the electrical conductivity (σ) of a granular paramagnetic Gadolinium Gallium Garnet (GGG: 0.3–26 vol%) and Teflon (PTFE) system are presented and discussed in relation to previously published (conductivity) and unpublished (permeability) studies on granular Fe 3 O 4 – talc and Ni – talc wax systems. In these systems plots of the real conductivity ( σ m ′ ) against the volume fraction ( φ ) lie on characteristic sigmoid curves that when fitted to the Two Exponent Phenomenological Percolation Equation (TEPPE) confirm the existence of “percolation microstructures” with critical volume fractions ( φ c ). The plots of the real and imaginary permeability ( μ m ′ ) and ( μ m ″ ) satisfactorily fit to the TEPPE using the φ c obtained in each case from the “conductivity” measurements. In all three cases the conductivity results gave the exponent t > 2, and the permeability results gave t

中文翻译：

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导电磁性-绝缘非磁性二元复合材料的磁导率和导电率的渗流行为。


摘要 介绍并讨论了粒状顺磁性钆镓石榴石（GGG：0.3–26 vol%）和聚四氟乙烯（PTFE）系统的复磁导率（μ）和电导率（σ）的实验结果（关于颗粒状 F​​e 3 O 4 - 滑石和 Ni - 滑石蜡体系的电导率）和未发表的（渗透率）研究。在这些系统中，真实电导率 ( σ m ′ ) 与体积分数 ( φ ) 的关系图位于特征 S 型曲线上，当拟合到二指数唯象渗流方程 (TEPPE) 时，证实了具有临界体积分数的“渗流微观结构”的存在( )。使用在每种情况下从“电导率”测量获得的 φ c，实部和虚部磁导率 (μ m ' ) 和 (μ m '' ) 的图与 TEPPE 令人满意地拟合。在所有三种情况下，电导率结果给出指数 t > 2，渗透率结果给出 t