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Physics of the Solid State

, Volume 50, Issue 5, pp 928–936 | Cite as

Phenomenological description of phase transitions in thin BaTiO3 films

  • V. B. Shirokov
  • Yu. I. YuzyukEmail author
  • B. Dkhil
  • V. V. Lemanov
Magnetism and Ferroelectricity

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.

PACS numbers

64.60.Kw 64.70.Kb 77.80.Bh 

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • V. B. Shirokov
    • 1
  • Yu. I. Yuzyuk
    • 1
    Email author
  • B. Dkhil
    • 2
  • V. V. Lemanov
    • 3
  1. 1.Southern Federal UniversityRostov-on-DonRussia
  2. 2.Laboratoire Structures Propriétés et Modélisation des Solides, Ecole Centrale ParisUMR-CNRS 8580Château-MalabyFrance
  3. 3.Ioffe Physicotechnical InstituteRussian Academy of SciencesSt. PetersburgRussia

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