0.95(Na_0.82K_0.18)_1/2Bi_1/2TiO₃–0.05FeNbO₄ (NKBT-0.05FN) lead-free incipient piezoceramic is a promising candidate for actuator applications due to their large reversible electromechanical strains. However, the driving electric field required to obtain such a large strain is too high to meet the requirements of commercial applications. In this study, 0.95(Na_0.82K_0.18)_1/2Bi_1/2TiO₃–0.05FeNbO₄ /(Na_0.82K_0.18)_1/2Bi_1/2TiO₃ (NKBT-0.05FN/NKBT) relaxor/ferroelectric (RE/FE) 2–2 type composite ceramics were designed to produce tailored strain properties. By tailoring the phase structure of the composites, a high strain of 0.36% and the corresponding large-signal piezoelectric coefficient d^*₃₃ of 720 pm/V were achieved using 90 vol.% NKBT-0.05FN/10 vol.% NKBT under a low driving electric field of 50 kV/cm.

0.95（Na _0.82 K _0.18）_1/2 Bi _1/2 TiO ₃ –0.05FeNbO ₄（NKBT-0.05FN）初生无铅压电陶瓷因其大的可逆机电应变而成为致动器应用的有希望的候选者。然而，获得如此大的应变所需的驱动电场太高，无法满足商业应用的要求。在本研究中，0.95（Na _0.82 K _0.18）_1/2 Bi _1/2 TiO ₃ –0.05FeNbO ₄ /（Na _0.82 K _0.18）_1/2 Bi _1/2 TiO ₃（NKBT-0.05FN / NKBT）弛豫/铁电（RE / FE）2-2型复合陶瓷旨在产生定制的应变特性。通过调整复合材料的相结构，在90℃的条件下使用90％（体积）的NKBT-0.05FN / 10％（体积）的NKBT可获得0.36％的高应变和相应的720 pm / V的大信号压电系数d ^* ₃₃ 50 kV / cm的低驱动电场。