Temperature-stable dielectric and energy storage properties of (0.94Bi0.47Na0.47Ba0.06TiO3-0.06BiAlO3)-NaNbO3 ceramics

The lead-free ceramics (1-x)(0.94Bi(0.47)Na(0.47)Ba(0.06)TiO(3)-0.06BiAlO(3))-xNaNbO(3) were prepared by means of a traditional solid-state sintering method. All ceramics have pure perovskite structure and average grain sizes around 1 mu m. Their dielectric and energy storage behavior were studied. The NaNbO3-doped ceramics display drastically reduced temperature coefficient of capacitance (TCC) compared to the ceramics without doping. The samples with x = 0.02 exhibit high permittivity and excellent temperature stability between 67 degrees C and 380 degrees C, meeting the requirement of TCC <= +/- 15%. The energy storage density was greatly improved to 1.71 J/cm(3) as x = 0.03, showing excellent frequency stability from 0.5 Hz to 100 Hz, great temperature stability from 25 degrees C to 130 degrees C, and excellent fatigue resistance within 10(5) fatigue cycles. (C) 2020 Elsevier B.V. All rights reserved.