Enhanced energy storage properties of 0.7Bi0.5Na0.5TiO3-0.3SrTiO3 ceramic through the addition of NaNbO3

Relaxor fermelectrics with high energy density and efficiency are good candidates for pulsed power devices. In the present work, (1-x) (0.7Bi(0.5)Na(0.5)TiO(3)-0.3SrTiO(3))-xNaNbO(3) (x = 0.0-0.10) [(1-x)(0.7BNT-0.35T)-xNN] ceramics were prepared using conventional solid state reaction method. The typical relaxor fermelectric behavior was found in all compositions. The transformation of the material from non-ergodic to an ergodic realxor ferroelectric phase with increasing NN content was revealed, which facilitated the enhanced recoverable energy (W-rec) and efficiency (eta). Specifically, 0.92(0.7BNT-0.35T)-0.08NN ceramic showed a high value of W-rec similar to 2.49 J/cm(3) with the eta similar to 85% at a low electric-field of 170 kV/cm and retained a small variation (+/- 11%) in W-rec and the high eta(>84%) over a broad temperature range (0 degrees C-120 degrees C). The remarkable performance of 0.92(0.7BNT-0.35T)-0.08NN ceramic making it promising for applications of low electric-field and temperature-stable energy storage capacitors.

Automated summary

The study indicates that the transformation of the material from non-ergodic to an ergodic relaxor ferroelectric phase facilitates an increase in recoverable energy and efficiency. Specifically, the 0.92(0.7BNT-0.35T)-0.08NN ceramic exhibits outstanding performance in low electric-field conditions and across a wide temperature range.