Modeling large reversible electric-field-induced strain in ferroelectric materials using 90° orientation switching  

作　　者：Roderick V. N. MELNIK 

机构地区：[1]Mathematical Modelling and Computational Sciences, Wilfrid Laurier University, Waterloo, 75 University Ave W, Canada N2L 3C5

出　　处：《Science China(Technological Sciences)》2009年第1期141-147,共7页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China to the first two authors (Grant No. 10872062)

摘　　要：Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau's theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitu- tive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and me- chanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a conse-quence of reversible orientation switchings via electro-mechanical couplings. Comparisons with ex-perimental results reported in literatures are presented.Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau’s theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitutive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and mechanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a consequence of reversible orientation switchings via electro-mechanical couplings. Comparisons with experimental results reported in literatures are presented.

关 键 词：LARGE ELECTROSTRICTION REVERSIBLE switchings double HYSTERESIS differential model 

分 类 号：TB34[一般工业技术—材料科学与工程]