Superior and anti-fatigue electro-strain in Bi0.5Na0.5TiO3-based polycrystalline relaxor ferroelectrics

By composition engineering and subtle criticality confinement, a giant recoverable electro-strain (S > 0.7%) with reduced hysteresis is reported in BNT-based relaxor ferroelectrics, which can be kept at a high level (<2% variation) even after 10⁵ fatigue cycles.