Enhanced energy storage density and its variation tendency in CaZrxTi1−xO3 ceramics

Abstract The improved energy storage density and its variation tendency have been investigated for CaZr x Ti 1− x O 3 ( x  = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) solid solution ceramics. The dense ceramics with high bulk density above 97% could be obtained, and X-ray diffraction analysis confirms the orthorhombic single phase structure in all compositions. Substitution of Zr 4+ obviously increases the sintering temperature, and the homogeneous fine grain structure is obtained. With increasing x , the dielectric constant e r decreases from 175 to 103, while the dielectric strength E b increases from 435 kV/cm to 756 kV/cm. The highest energy storage density of 2.7 J/cm 3 is achieved at x  = 0.4, which is much higher than that of CaTiO 3 end-member. The energy storage density significantly increases with decreasing the thickness due to the increased dielectric strength (For the samples with x  = 0.5, the dielectric strength increases from 584 kV/cm to 756 kV/cm while the energy storage density increases from 1.6 J/cm 3 to 2.6 J/cm 3 when the thickness changes from 0.50 mm to 0.15 mm).