High energy storage properties in Ca0.7La0.2TiO3-modified NaNbO3-based lead-free antiferroelectric ceramics

Abstract

In this work, (1 [Formula: see text])(0.92NaNbO3–0.08BaTiO3)–[Formula: see text]Ca[Formula: see text]La[Formula: see text]TiO3 (NNBT – [Formula: see text]CLT) ceramics were successfully designed and prepared by the solid-state reaction method. Investigations on the structure, dielectric, and energy storage properties were performed. The NNBT – 0.25CLT ceramic with orthorhombic phase at room temperature was found to exhibit extremely small grain size and compacted microstructure. A large [Formula: see text] of 3.1 J/cm3 and a high [Formula: see text] of 91.5% under the electric field of 360 kV/cm were achieved simultaneously in the sample. In addition, the energy storage performance of the sample exhibits thermal stability over the temperature range of 25–140[Formula: see text]C and the frequency range of 5–500 Hz. The charge and discharge tests reveal that the ceramic shows a large current density [Formula: see text] of 965 A/cm2 and power density [Formula: see text] of 154 MW/cm3. This work demonstrates that the NNBT–0.25CLT ceramic is a prospective energy storage material for potential application in the field of pulsed power devices.