Journal
APPLIED PHYSICS LETTERS
Volume 86, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1855389
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A nonlinear thermodynamic theory is used to predict the equilibrium polarization states and dielectric properties of ferroelectric thin films grown on dissimilar substrates which induce anisotropic strains in the film plane. The misfit strain-temperature phase diagrams are constructed for single-domain PbTiO3 and Pb0.35Sr0.65TiO3 films on orthorhombic substrates. It is shown that the in plane strain anisotropy may lead to the appearance of new phases which do not form in films grown on cubic substrates. The strain-induced dielectric anisotropy in the film plane is also calculated and compared with the anisotropy observed in Pb0.35Sr0.65TiO3 films deposited on NdGaO3. (C) 2005 American Institute of Physics.
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