Abstract
Achieving a simplified BNT-based composition with giant strain properties is challenging, since traditional chemical substitutions rely on trial-and-error experiments and complicates the composition. Herein, we comprehend the strain regulation mechanism from a view of relaxors and propose strain regulation rules based on classical relaxor theory. In BNT-based systems, site inequality of the random field for the ergodicity modification is observed, arising from the discrepant random field-driven (e.g., intensity and action position) structural distortions. From a phenomenological view, B-site substitution is effective in regulating relaxation behaviors due to the stronger lattice softening effect. This work points out the essence of regulating strain properties in BNT-based systems, and the proposed phenomenological relaxation regulation rules are believed to advance the development of actuator applications.
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