Two-dimensional thermodynamic theory of epitaxial Pb(Zr,Ti)O-3 thin films

Article

关键词: SOLID-SOLUTION SYSTEM;    PHASE-TRANSITIONS;    POLARIZATION;    DEPENDENCE;    BOUNDARY;    STRESS;    STATE;    BULK;   

DOI  :  10.1103/PhysRevB.62.14757

来源: SCIE

【 摘 要 】

Effects of film stresses on the phase stability and various ferroelectric properties of the epitaxially oriented Pb(Zr,Ti)O-3 thin film were theoretically investigated. For this purpose, a two-dimensional thermodynamic model was developed using the Landau-Devonshire phenomenological theory. The theoretical computation predicts an increase in the para-ferroelectric transition temperature and an enhanced thermodynamic stability of the tetragonal-phase field, irrespective of the sign of stress (i.e., both tensile and compressive). In particular, it is predicted that tensile stress makes a new ferroelectric orthorhombic phase stable. We have also shown that dielectric properties usually exhibit their maximum Values at a newly established Zr-rich morphotropic phase boundary, except for those parallel to the direction of the spontaneous polarization.

【 授权许可】

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