Abstract
The paradoxical relationship between ferroelectric polarization and dielectric breakdown to a great extent hinders the increase in energy storage properties of dielectric materials. A strategy of combining large polarization and high dielectric breakdown by composition optimization was designed in (Sr0.7Bi0.2)TiO3–BiFeO3 system. All ceramics show dense microstructures with fine grain sizes. A promising energy density of 3.67 J/cm3 with an efficiency of 89.1% can be obtained in 0.93(Sr0.7Bi0.2)TiO3-0.07BiFeO3 at 340 kV/cm. The energy density shows excellent temperature reliability in a wide temperature range till 160 °C and reliable fatigue endurance till 105 cycles. This research expands the strategy of combing large polarization and dielectric breakdown for developing novel dielectrics used in pulse power electronics.
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