Study of the volume fraction, temperature, and pressure dependence of the resistivity in a ceramic-polymer composite using a general effective media theory equation 

 -  Journal of Materials Science, 26(21), p.5899-5903, 1991 .
<br/><br/> A quantitative general effective media (GEM)equation is used to describe quantitatively the resistivity of an Fe304-epoxy composite system over a large range of volume fractions in terms of the resistivities of each component and two percolation morphology parameters. One parameter is the critical (percolation)volume fraction, qb c, and the other is an exponent, t. Preliminary models, also based on the GEM equation, are used to describe the positive temperature coefficient of resistivity (PTC)and the piezoresistivity (uniaxial pressure)of the composite when the composition is near the percolation threshold.