Equation for the Conductivity of Hetrogeneous Binary Media

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Abstract
An equation is presented which describes the conductivity (resistivity) of a wide variety of binary macroscopic mixtures as a function of the conductivities (resistivities) of the components, the volume (area) fraction of each, and two morphology parameters. For metal-insulator and normal-superconductor systems the equation has the mathematical form of the percolation equation. In this paper the Ge–Aℓ (4.2K and 300K-) and Ge–Pb (8K and 300K) metal-insulator systems are shown to fit this equation, well within the experimental accuracy.

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