Publication Type:Journal Article
Source:Applied Physics Letters, Volume 97, Number 15 (2010)
Keywords:Landau-Devonshire theory, Misfit strains, Mixed structure, Orthorhombic phasis, phase transitions, Piezoelectric property, Piezoelectric response, piezoelectricity, Single domains
Strain-driven phase transitions and related intrinsic polarization, dielectric, and piezoelectric properties for single-domain films were studied for BiFeO3 using phenomenological Landau-Devonshire theory. A stable and mixed structure between tetragonal and rhombohedral-like (monoclinic) phases is predicted at a compressive misfit strain of um =-0.0382 without an energy barrier. For a tensile misfit strain of um =0.0272, another phase transition between the monoclinic and orthorhombic phases was predicted with sharply high dielectric and piezoelectric responses. © 2010 American Institute of Physics.
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