Abstract
Temperature dependence of d.c. electrical conductivity has been investigated for two different ferroelectric-polymer composites, namely, triglycine sulphate-polyvinyl alcohol (TGS-PVA) and triglycine sulphate-polyvinyl chloride (TGS-PVC). The behaviour of conductivity of composite (TGS-PVA) was found to depend upon the component of higher concentration. The values of activation energies indicate an ionic nature of conduction. For PVC composites, the internal biasing field of TGS particles appears to affect the mobility of polar groups in PVC molecules leading to the appearance of a peak, which was observed in all composites.
Bounds for effective electrical conductivities for such composites were estimated. The experimental values were within the Wiener bounds and almost fit to a theoretical curve.