A Mesoscopic Electromechanical Theory of Ferroelectric Films and Ceramics
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We present a multi‐scale modelling framework to predict the effective electromechanical behavior of ferroelectric ceramics and thin films. This paper specifically focuses on the mesoscopic scale and models the effects of domains and domain switching taking into account intergranular constraints. Starting from the properties of the single crystal and the pre‐poling granular texture, the theory predicts the domain patterns, the post‐poling texture, the saturation polarization, saturation strain and the electromechanical moduli. We demonstrate remarkable agreement with experimental data. The theory also explains the superior electromechanical property of PZT at the morphotropic phase boundary. The paper concludes with the application of the theory to predict the optimal texture for enhanced electromechanical coupling factors and high‐strain actuation in selected materials.
[1] William H. Press,et al. Numerical recipes in FORTRAN (2nd ed.): the art of scientific computing , 1992 .
[2] Yuhuan Xu,et al. Ferroelectric Materials and Their Applications , 2023, Japanese Journal of Applied Physics.
[3] Domain Patterns, Texture and Macroscopic Electro-mechanical Behavior of Ferroelectrics , 2001 .
[4] L. Eric Cross,et al. Ferroelectric Ceramics: Tailoring Properties for Specific Applications , 1993 .