P-E hysteresis loop evaluation and dielectric studies of ceramic obtained from white rice husk ash for electronic applications

The electrical properties of a ceramic obtained from white rice husk ash (WRHA) was reported in this study for electronic applications. Some material's characteristics were evaluated for better understanding. The ceramic was prepared using die-pressing technique and bulk density was determined using Archimedes' method. The residual pore contents of the sample were investigated using SEM micrographs. XRD and XRF analysis were done to investigate the molecular structure and chemical composition of the ceramic. Dielectric characteristics of the specimen were measured using LCR meter. Sawyer-Tower circuit was the method to measure polarization-electric field (P-E) hysteresis loop. The WRHA ceramic has low dielectric constant of 16.4 and dielectric loss tangent of 0.36 at 100 kHz. The highest dielectric constant (65.2) of the specimen possessed by sintering temperature of 900 degrees C and frequency of 1 kHz. P-E loop measurement indicates that the WRHA ceramic is "capacitor-like'', when sintered at 900 and 1200 degrees C. The best temperature for sintering the sample was evaluated 1200 degrees C, to be a good dielectric material.