Synthesis Characterisation of High Dielectric Constant by Solid State Route and Sol-Gel Route

Abstract

BaTio3 which is a ferro-electric material, is prepared by solid route method and mixed with different mass percentage (2, 4, 6 & 8 wt. %) of NiO and ZnO. The structural analysis was done by XRD. The well-defined crystalline XRD pattern was observed with single phase. The study of the dielectric variation which also covers the calculation of variation with temperature and frequency. The study also covers the calculation of density of different pallets. Calcination of BT is done at 11500 C and BT compositions were conventionally sintered at 12500C for 4hrs each. BT + x NiO/yZnO (x=6, y=8 wt. %) composition is selected among four composition of NiO and ZnO on the basis high dielectric constant value is prepared by sol gel route. Calcination of BT + x NiO/yZnO (x=6, y=8 wt. %) is done in microwave furnace at 8000C for 40 min. at heating rate 250C/min. And sintering is done in microwave furnace at 11000C for 40 min at heating rate 250C/min. XRD is taken for sintered pellet and calcined powder which conforms single phase formation. The study of dielectric is done with variation of temperature and frequency and compare with the composition prepared by solid route which shows dielectric constant value decrease in sol gel composition. Morphological study is conducted by FESEM it is found that the grains were well developed and grain size is reduce in composition made by sol gel than solid state route. The PE-LOOP analysis shows well define ferroelectric behaviour in composition made by sol gel and conducting behaviour in composition made by solid state route. Above analysis shows that dielectric constant value decreases with decrease in grain size.