Investigation of structural, micro-structural, electrical, and leakage current characteristics of Bi0.5K0.5TiO3-CaSnO3-CaSeO3 ferroelectric ceramics

This research work deliberates the structural, dielectric and electrical characteristics of a mixed oxide method prepared CaSnO3/ CaSeO3 modified bismuth potassium titanate (Bi0.5K0.5TiO3 = BKT) of a chemical composi-tions (1-2x)(Bi0.5K0.5)TiO3-xCaSnO3-xCaSeO3 (x = 0, 0.05, 0.10, 0.15). The room temperature XRD patterns show the formation of single-phase perovskite compounds with tetragonal symmetry. Surface morphology of the pellets (carried out by using scanning electron microscopy) shows the uniform distribution of the rectangular grains with varying size over the surface. The temperature-frequency dependence of dielectric and electrical parameters has provided many interesting features of the materials including ferroelectric phase transition, dielectric relaxation/ dispersion, and conduction mechanism. The electrical properties of the parent compound BKT change significantly by equally adding CaSnO3 and CaSeO3 to it. The PE hysteresis loop confirms the ferroelectricity of the synthesized compounds. The analysis of J-E characteristics indicates that their conduction mechanism is of Ohmic type with a very small amount of leakage current.

Automated summary

This research investigates the structural, dielectric, and electrical characteristics of a modified Bi0.5K0.5TiO3 (BKT) material by incorporating CaSnO3 and CaSeO3. XRD analysis confirms the formation of single-phase perovskite compounds with tetragonal symmetry. SEM imaging reveals the uniform distribution of rectangular grains with varying sizes on the surface. The study of dielectric and electrical parameters provides insights into ferroelectric phase transitions, dielectric relaxation/dispersion, and conduction mechanisms.