Dielectric temperature stability and energy storage performance of NBT-based lead-free ceramics for Y9P capacitors

In this work, novel (1 - x)(0.75Na(0.5)Bi(0.5)TiO(3))-0.25Sr(Zr0.2Sn0.2Hf0.2Ti0.2Nb0.2)O-3-xNaNbO(3) (NFIT-SZSHTN-xNN, x = 0.1, 0.15, 0.2, 0.25) ceramics were fabricated. The influence of co-doping of NN and high entropy perovskite oxide (SZSLITN) on the phase structure, microstructure and dielectric properties of NOT-based lead-free ceramics was investigated. Dense microstructure with a grain size of similar to 5 mu m is observed. When x = 0.25, a wide dielectric temperature stable range of -35.4-224.3 degrees C with a low temperature coefficient of capacitance of < 10% is achieved, fulfilling the industry standard of Y9P specification. Furthermore, excellent energy storage performance with recoverable energy density of 2.4 J/cm(3), discharge efficiency of 71%, power density of 25.495 MW/cm(3) and discharge rate < 200 us are simultaneously obtained, which shows great potential for high temperature capacitor applications.