Structure, dielectric, ferroelectric, and energy density properties of (1 - x)BZTaxBCT ceramic capacitors for energy storage applications

We investigate the dielectric, ferroelectric, and energy density properties of Pb-free (1 ? x)BZTaxBCT ceramic capacitors at higher sintering temperature (1600 degree C). A significant increase in the dielectric constant, with relatively low loss was observed for the investigated {Ba(Zr0.2Ti0.8)O3}(1?x ){(Ba0.7Ca0.3)TiO3} x (x = 0.10, 0.15, 0.20) ceramics; however, electric breakdown was low (~140, 170, 134 kV/cm), and of which room temperature (300 K) charging curve energy density values are largest ~0.88, 0.94, and 0.87 J/cm3 with maximum high dielectric constant values ~7800, 8400, and 5200, respectively. Bulk ceramic BZTaBCT materials have shown interesting energy densities with good energy storage efficiency (~72 %) at high sintering temperature; they might be one of the strong candidates for high energy density capacitor applications in an environmentally protective atmosphere.