A novel criterion for nonuniform domain switching of tetragonal ferroelectrics

作者：Cui Yuanqing; Zhong Zheng^*

来源：Mechanics of Materials, 2012, 45: 61-71.

DOI：10.1016/j.mechmat.2011.10.004

• Ferroelectric ceramics
• Nonuniform process zone
• Volume fraction
• Minimum energy principle
• Nonhomogeneous switching criterion

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.

• 出版日期2012-2
• 单位同济大学