Electrostrictive strain enhancement method for sodium bismuth titanate-based relaxor ferroelectric

The invention relates to the technical field of materials, and discloses an electrostrictive strain enhancement method for a sodium bismuth titanate-based relaxor ferroelectric. According to the invention, pre-polarization operation of an alternating electric field is carried out on the sodium bismuth titanate-based relaxor ferroelectric ceramic which is synthesized by a traditional solid phase method and is located near a critical position, and an original large-size non-traversal polarity region is induced in a traversal sodium bismuth titanate-based relaxor, so that a nucleation barrier in a field-induced strain process is reduced; and the electrostrictive strain effect is obviously enhanced. After simple treatment, the electrostrictive strain of the sodium bismuth titanate-based relaxor ferroelectric ceramic under excitation of a 60 kV/cm electric field is obviously improved compared with that in an initial state, and the sodium bismuth titanate-based relaxor ferroelectric ceramic has more excellent perfo