Studies on Structural, Dielectric, and Electrical Properties of the PMMA-BNT Ceramics Polymer Composites

In this communication, the structural and electrical properties of modified polymethyl methacrylate bismuth nickel titanate ceramic polymer composites are reported. The nickel doped bismuth titanate ceramics are prepared using a high-temperature solid-state reaction technique and composites with 3 and 10% ceramic fillers are prepared using the solution casting method. The average crystallite size for 3 and 10% ceramic fillers is 28.8 nm and 21 nm respectively. The structural analysis confirms the presence of the nickel phase in the composite films. The scanning electron microscopy micrograph reveals the irregular distribution of ceramic particles over composite films, particularly in 10% fillers. The study of dielectric properties suggests that the composites have a high dielectric constant and low loss, which is related to the irregular distribution of the fillers in the polymer matrix. The conductivity increases with an increase in frequency and it also obeys the universal power law. The impedance study shows the conduction process increases with an increase in frequency and confirms negative temperature coefficient resistance character. The modulus study indicates the presence of dielectric relaxation in a high concentration of ceramic fillers. The semiconductor nature of the composite is confirmed and it may find suitable applications in microelectronic devices and sensors.