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Article Dans Une Revue Physics of the Solid State Année : 2008

Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films

V.-B. Shirokov
  • Fonction : Auteur
Yu. I. Yuzyuk
  • Fonction : Auteur
V.-V. Lemanov
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-00176396 , version 1 (03-10-2007)

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Citer

V.-B. Shirokov, Yu. I. Yuzyuk, B. Dkhil, V.-V. Lemanov. Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films. Physics of the Solid State, 2008, 50 (5), pp.928-936 ⟨10.1134/S106378340805020X⟩. ⟨hal-00176396⟩
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