Dielectric loss of 2D metal-insulator composite near the percolation threshold

TL;DR

This paper investigates how the dielectric loss angle in a 2D metal-insulator composite varies with frequency near the percolation threshold, providing insights into critical links and phase proportions.

Contribution

It establishes a connection between the dielectric loss angle's frequency dependence and the critical links and phase composition in the composite near the percolation threshold.

Findings

Dielectric loss angle behavior is similar to critical links near the threshold.

Frequency dependence relates to the proportion of phases in the composite.

Method aids in experimental determination of percolation threshold.

Abstract

The frequency dependence of the dielectric loss angle for a metal-insulator composite was shown previously to be an efficient method to experimentally determine the percolation threshold. The statistical properties of this angle are found here to be similar to those of the critical links (supporting the total current) near the percolation threshold close to dc and for very high frequencies. A further discussion is provided about the way to connect this angle to the critical links. The second aim of these studies is to connect the frequency dependence of this angle to the proportion of the conductor or dielectric phase in this composite.