Progress and perspective of high strain NBT-based lead-free piezoceramics and multilayer actuators

In this review, the evolution of high strain Na0.5Bi0.5TiO3-based lead-free piezoceramics and their multilayer actuators has been explored. First, in terms of Na0.5Bi0.5TiO3-based ceramic materials, the origin of high strain, the typical chemical modification methods of obtaining large strain and extrinsic factors affecting the large strain are discussed. Then it briefly summarizes the problems existing in Na0.5Bi0.5TiO3-based ceramics for multilayer actuator applications. Strategies to optimize strain performance by means of microstructure control and phase structure design are also discussed. Thereafter, in terms of multilayer actuator, we describe its characteristics, applications and preparation process systematically, as well as the recent development of Na0.5Bi0.5TiO3-based multilayer actuator. At last, perspectives on directions of following work and promising fields for the applications of the materials and their devices are presented.