A novel criterion for nonuniform domain switching of tetragonal ferroelectrics |
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| Affiliation: | 1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an 710126, China;2. Frontier Research Center of Thin Films and Coatings for Device Applications, Academy of Advanced Interdisciplinary Research, Xidian University, Xi''an 710126, China;3. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;5. College of Engineering, BIC-ESAT, Peking University, Beijing 100871, China |
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| Abstract: | This paper issues a simple criterion to characterize nonuniform domain switching. The criterion is obtained by minimizing switch-induced system energy change computationally. Combining the numerical result and experimental observations, we propose a quasi-analytic criterion defined by a piecewise function. The piecewise criterion is observed to coincide with the accurate solution very well. As examples, we apply the criterion to: (1) portray a nonhomogeneous switching zone near a stationary crack tip; (2) quantify the switch zone size; (3) predict the volume fractions of ferroelastic and ferroelectric switchings. These predictions all agree with experimental measurements. |
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