An unconventional phase field modeling of domains formation and evolution in tetragonal ferroelectrics

摘要: Based on characteristic functions of variants, we developed an unconventional phase field modeling for investigating domains formation and evolution in tetragonal ferroelectrics. In order to develop this computational approach, constructed the anisotropy energy which is used instead Landau-Devonshire potential conventional method, resulting that much fewer parameters are needed simulations. This approach advantageous simulations emerging ferroelectric materials. We employ it study barium titanate single crystal, as well nonlinear behaviors under cyclical stress electric loading. A multi-rank laminated domain pattern, 90° switching accompanied by polarization rotation, 180° move wall predicted. It found speed slower than switching, due both transformation strain changed switching. also suggests large actuation can be generated crystal ferroelectrics via combined electromechanical loading inducing The good agreement between simulation results experimental measurements observed.