Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1863379 | Physics Letters A | 2007 | 8 Pages |
Abstract
A phenomenological Landau-Devonshire 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(Zr1âxTix)O3 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 (aâ², aâ³, aâ²c, and aâ³c) and the direct 90° polarization switching between c phase and aâ² phase (or aâ³ phase), between aâ² phase and aâ³ 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
J.H. Qiu, Q. Jiang,