Relaxor ferroelectric 0.9BaTiO3-0.1Bi(Zn0.5Zr0.5)O3 ceramic capacitors with high energy density and temperature stable energy storage properties

A relaxor ferroelectric ceramic for high energy storage applications based on 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 (0.9BT-0.1BZZ) was successfully fabricated via a conventional solid-state method. The sintered samples have a perovskite structure with a pseudocubic phase, showing a moderate dielectric constant (500-2000), low dielectric loss (tan delta < 0.15) and highly diffusive and dispersive relaxor-like behavior. The weak dielectric nonlinearity exhibits a dielectric constant change of similar to 10% as the bias electric field increases from 0 kV cm(-1) to 40 kV cm(-1). Extra slim polarization-electric field loops accompanying the slow decrease of breakdown strength from 266.5 kV cm(-1) to 217.7 kV cm(-1) are observed in a measured temperature range of 30-150 degrees C. A maximum energy density of 2.46 J cm(-3) was obtained at the electric field of 264 kV cm(-1) close to the breakdown strength at ambient temperature. Temperature stability of both energy density and energy efficiency exists in a wide temperature range, which makes BT-BZZ ceramics promising candidates for high power electric applications.