Physics of the Solid State

, Volume 58, Issue 10, pp 2027–2034 | Cite as

Phase transitions in barium–strontium titanate films on MgO substrates with various orientations

  • A. S. Anokhin
  • A. G. Razumnaya
  • Yu. I. YuzyukEmail author
  • Yu. I. Golovko
  • V. M. Mukhortov


A comparative study of the lattice dynamic upon phase transitions in a polycrystalline Ba0.8Sr0.2TiO3 (BST) film on a Pt substrate and in epitaxial BST films grown on various sections of an MgO substrate has been performed by Raman spectroscopy. It has been found that different sequences of phase transitions take place in these films. The BST/Pt films demonstrate the same sequence of phase transitions that is observed in the bulk ceramics. The hardening of a soft mode in BST/(001)MgO and BST/Pt films shows that the transition from the tetragonal ferroelectric phase to the paraelectric phase has features of the displacement-type phase transition and also the order–disorder phase transition. When approaching the ferroelectric transition temperature, the soft mode in the BST/(111)MgO film is softened, following the Cockran law, which indicates the displacement-type phase transition.


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© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • A. S. Anokhin
    • 1
    • 2
  • A. G. Razumnaya
    • 1
  • Yu. I. Yuzyuk
    • 1
    Email author
  • Yu. I. Golovko
    • 2
  • V. M. Mukhortov
    • 2
  1. 1.Southern Federal UniversityRostov-on-DonRussia
  2. 2.Southern Scientific CenterRussian Academy of SciencesRostov-on-DonRussia

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