High Energy Storage Density in Nd(Zn<sub>2/3</sub>Nb<sub>1/3</sub>)O<sub>3</sub>‐Doped BiFeO<sub>3</sub>–BaTiO<sub>3</sub> Ceramics
Wen‐Yi Li, Di Zhou, Da Li, Yan Guo, Weichen Zhao, Li‐Xia Pang, Shi‐Kuan Sun
Abstract
Abstract Lead‐free ceramics with high recoverable energy density ( W rec ) and energy storage efficiency (η) are attractive for advanced pulsed power capacitors to enable greater miniaturization and integration. In this work, a series of perovskite structured (1‐ x )(Bi 0.6 Ba 0.4 )(Fe 0.6 Ti 0.4 )O 3 − x Nd(Zn 2/3 Nb 1/3 )O 3 (BF‐BT‐NZN) ceramics with high energy storage density through the solid‐state reaction method are successfully prepared, and the breakdown strength ( E b ) and energy storage density are further improved by a membrane rolling process. The highest energy densities of the 0.94(BF‐BT)−0.06NZN ceramics are W rec ≈ 5.6 J cm −3 and η ≈ 82.9%, which are due to the enhanced breakdown field intensity (BDS ≈ 400 kV cm −1 ) and the maximum polarization ( P max ≈ 38 µC cm −2 ). These results indicate that (1− x )(Bi 0.6 Ba 0.4 ) (Fe 0.6 Ti 0.4 )O 3 − x Nd(Zn 2/3 Nb 1/3 )O 3 ceramics are high‐efficiency lead‐free materials for potential application in high‐energy‐storage capacitors.