Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 16, Pages 3722-3725Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3722
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A thermodynamic theory is developed for dense laminar domain structures in epitaxial ferroelectric films. It is found that. at some critical misfit strain between the film and substrate, the 90 degrees c/a/c/a domain structure becomes unstable with respect to the appearance of the polarization component parallel to domain walls, which results in the formation of a heterophase structure. For PbTiO3 and BaTiO3 films, the stability ranges of polydomain and heterophase states are determined. Dielectric anomalies accompanying misfit-strain-driven structural transformations are described.
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