Dielectric studies and AC conductivity of piezoelectric barium titanate ceramic polymer composites

In this work, ceramics barium titanate (BT) polymer composites were prepared with BT/polyvinyl alcohol (PVA) having a ceramic concentration of 10, 30, and 50% by weight using solution casting method. The prepared thin film samples were characterized by X-ray diffraction for phase analysis. Scanning electron microscope (SEM) studies on composite films revealed ceramic crystallites are well dispersed in the polymer matrix. The dielectric constant ( ε _r ) and the AC conductivity at room temperature and at different frequencies (100 Hz–5 MHz) of the piezoelectric composites with different concentrations were investigated. The result shows that the dielectric constant of ceramic-PVA composites was found to increase as ceramic concentration increases and the dielectric loss tangent decreased with increasing concentration. AC conductivity of the composites increased with increasing frequency.