Loading frequency-dependent hysteresis behaviors of ferroelectric polycrystals: a phase-field study
Ning Liu (), Yu Su (Beijing Institute of Tech)
Prager Medal Symposium in honor of George Weng: Micromechanics, Composites and Multifunctional Materials
Tue 10:45 - 12:15
MacMillan 117
In this work the hysteresis behaviors of ferroelectric ceramics are numerically studied with different electrical loading frequencies. The material under investigation is barium titanate (BaTiO3) ceramic, which shows noticeable frequency-dependent response upon applied bipolar electric field. A two dimensional (2D) polycrystalline phase-field model, which considers the loading frequency effects, is developed to investigate the microstructural evolution and hysteresis behavior of the BaTiO3 polycrystals. The electrical loading frequency dependence of the ferroelectric properties, e.g., coercive field, remnant polarization, etc., is expected to be observed through the phase-field computation and the microstructural characteristics under dynamic loading can be numerically captured as well. By studying the computed hysteresis and domain patterns of BaTiO3 ceramics with different loading frequencies, one can have a better understanding of the domain switching mechanism of ferroelectric polycrystals under dynamic loading.