LAUSR

0.95(Na 0.82 K 0.18 ) 1/2 Bi 1/2 TiO 3 –0.05FeNbO 4 (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 0.82 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) 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.