AC conductivity, electrochemical and magnetic studies of CoWO4/PbWO4 nanocomposites

Abstract

Structural, AC conductivity, electrochemical and magnetic properties of CoWO4 and CoWO4/PbWO4 nanocomposites are reported in the present manuscript. Structural characterization and HRTEM images of the nanocomposites confirm interface formation. Room temperature (RT) DC conductivity (theta dc) calculated from Jonscher power law, carrier concentration (N) and carrier mobility (mu) of the interfaced sample with maximum agglomeration (P2) are 6.7 times, 3 orders and 4 orders higher than that of CoWO4 sample respectively. Enhanced AC conductivity is also observed for P2 sample. These enhanced properties of P2 sample are due to the space charge layer (SCL) formation at the interface. Conduction models for all the samples are explained in detail. The specific capacitance (calculated from GCD curve) of the CoWO4 sample is 2.1 times larger than the CoWO4/PbWO4 nanocomposite for 1 A/g of current density. Paramagnetic behaviour at (RT) and antiferromagnetic nature below the transition temperature (TN) are observed for all the samples.