High energy storage properties of 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ ceramics by incorporating Sr_0.8Bi_0.1γ0.1Ti_0.8Zr_0.2O_2.95

Abstract

Ceramics with high-energy storage density are in high demand across various industries. In this regard, lead-free relaxor ferroelectric ceramics were synthesized using the conventional solid-state reaction method with the composition (1-x)[0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃]-xSr_0.8Biγ_0.1Ti_0.8Zr_0.2O_0.95, abbreviated as BNBT-xSBTZ. The incorporation of SBTZ in BNBT ceramics significantly improved their relaxation properties. Specifically, the 0.91BNBT-0.09SBTZ ceramics displayed a breakdown electric field of up to 230 kV/cm, with a recoverable energy storage density (W_r) of 2.68 J/cm³ and an energy storage efficiency (η) of 74.4%. Additionally, this sample demonstrated remarkable temperature stability and fatigue resistance, with only an 11% decrease in W_r observed from room temperature to 140 °C and a 13.3% reduction in W_r after 10⁵ electrical cycles. Therefore, the 0.91BNBT-0.09SBTZ ceramic is a promising dielectric material suitable for energy-storage dielectric capacitors.

Keywords

Energy storage properties / lead-free ceramics / temperature stability / fatigue resistance

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