Enhanced the energy storage performance of NBT-BY relaxor ferroelectric ceramics doped by STO
(1- x ) (0.99 Na 0.5 Bi 0.5 TiO 3 -0.01BiYbO 3 )- x SrTiO 3 (abbreviated as (1- x ) (0.99NBT-0.01BY)- x STO) ( x = 0.1⁓0.4) relaxor ferroelectric ceramics were fabricated by a solid-state reaction method. The crystal structure, surface morphology as well as dielectric , ferroelectric and energy storage properties of (1- x ) (0.99NBT-0.01BY)- x STO were investigated in detail. X-ray diffraction patterns show that NBT-BY-STO ceramics have a single perovskite structure with a pseudo-cubic phase. The introduction of STO can effectively refine the NBT-based ceramic grain. The relaxation behavior of NBT-BY can be enhanced by incorporating moderate STO, and the impedance reduced with the increase of STO content. The results of hysteresis loop analysis indicate that incorporating STO into NBT-BY contributes to an increase in the electric breakdown field and a reduction in remnant polarization, thus enhancing its energy storage performance significantly. A moderate energy storage property with large W rec (∼2.5 J/cm 3 ) and high η (∼80.97%) was achieved at 260 kV/cm for x = 0.4. Meanwhile, 0.98(0.99NBT-0.01BY)− 0.2STO relaxor ferroelectric ceramic presented relatively good frequency and temperature stabilities of W rec and η . This work provides an effective strategy for enhancing the energy storage performance of NBT-based relaxor ferroelectric ceramics applied in pulsed power devices.
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