Anisotropic in-plane misfit strains dependence of phase diagrams and dielectric behavior in epitaxial Pb(Zr1-xTix)O-3 thin films

作者：Qiu J H^*; Jiang Q

来源：Physics Letters A, 2007, 370(1): 82-89.

DOI：10.1016/j.physleta.2007.05.027

A phenomenological Landau-Devon shire thermodynamic theory is used to describe the effects of anisotropic in-plane misfit strains on equilibrium polarization states and dielectric properties of single domain epitaxial Pb(Zr1-xTix)O-3 thin films grown on dissimilar orthorhombic substrates. Compared with the "isotropic in-plane misfit strains-temperature" phase diagrams, the characteristic features of "misfit strain-misfit strain" and "misfit strain-temperature" phase diagrams under the circumstance of strain anisotropy are the presence of four different phases (a', a '', a'c, and a '' c) and the direct 90 degrees polarization switching between c phase and a' phase (or a '' phase), between a' phase and a '' phase. The misfit strain dependence of polarization components, the small-signal dielectric responses and the tunabilities at room temperature are also calculated. We find that the phase diagrams and dielectric properties largely depend on anisotropic in-plane misfit strains as well. Moreover, the strain anisotropy will lead to the polarization and dielectric anisotropy.

• 出版日期2007-10-8
• 单位苏州大学; 宿州学院