PZT铁电陶瓷力电耦合的三维相场模拟

3D PHASE FIELD SIMULATION OF MECHATRONIC COUPLE FOR PZT FERROELECTRIC CERAMICS

利用三维相场理论模拟了铁电材料的自发极化、电滞回线以及力电耦合对畴变的影响.结果表明,外场下的畴变是通过新畴形核及畴壁移动所引起的长大实现的.逐渐改变外场时,在矫顽场附近各类电畴均发生90°畴变,从而导致极化强度突变.沿垂直电场方向加拉、压应变能阻止或促进沿电场方向的畴变.

Using 3D phase field theory, the spontaneous polarization, hysteresis loop and effect of mechatronic coupling of domain switching of PZT ferroelectric ceramics have been simulated. The results show that the domain switching under applied electric field is realized through nucleation and growth of new domains. When the applied electrical field varies gradually, the reversal process is through 90° domain switching near the coercive field. A tensile or compressive strain perpendicular to the electric field can hinder or promote domain switching.