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PHASE TRANSFORMATION CHARACTERISTICS OF BARIUM STRONTIUM TITANATE FILMS ON ANISOTROPIC SUBSTRATES WITH (001)//(001) EPITAXY

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Abstract:

The role of anisotropic misfit strains on the spontaneous polarization of (100) oriented Ba0.6Sr0.4TiO3 thin films on (100) orthorhombic substrates is theoretically analyzed. A modified thermodynamic model is utilized to evaluate the equilibrium polarization values as a function of the anisotropic misfit strains. Results show that ferroelectric phases that cannot be observed in single-crystal Ba0.6Sr0.4TiO3 can be stabilized due to the reduction in the symmetry induced by the anisotropic strain state.

Keywords: Ferroelectric thin films; anisotropy; monoclinic phase; thermodynamics

Document Type: Research Article

DOI: https://doi.org/10.1080/10584580802451413

Affiliations: 1: Materials Science & Engineering Program, CMBE Department & Institute of Materials Science, University of Connecticut, Storrs, CT, USA 2: Max Planck Institute for Microstructure Physics, Weinberg, Halle-Saale, Germany

Publication date: 2008-01-01

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