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Phenomenological description of phase transitions in thin BaTiO3 films

Abstract : Phase transitions in thin epitaxial films of BaTiO3 are described phenomenologically in terms of Landau potentials with sixth-and eighth-order terms. It is established that the phase diagram depends on the electrostrictive constant Q 12. The phase diagrams calculated for different values of Q 12 available in the literature differ qualitatively. The dependence of the misfit strain of a film on the film tetragonality at room temperature is found, which makes it possible to determine the thermodynamic path in the phase diagram for a specific film. The dependences of the spontaneous polarization and dielectric constant of a film on the misfit strain at room temperature are constructed. © 2008 Pleiades Publishing, Ltd.
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V.B. Shirokov, Yu.I. Yuzyuk, B. Dkhil, V.V. Lemanov. Phenomenological description of phase transitions in thin BaTiO3 films. Physics of the Solid State, 2008, 50 (5), pp.928-936. ⟨10.1134/S106378340805020X⟩. ⟨hal-02269778⟩



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