Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films

Details Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films

2007-03-16

arxiv.org/abs/cond-mat/0703439v2

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.224116

We develop a phenomenological thermodynamic theory of ferroelectric BaTiO3 (BT) thin films epitaxially grown on cubic substrates using the Landau-Devonshire eight-order potential. The constructed "misfit-temperature" phase diagram is asymmetrical. We found that, overall view of the phase diagram depends on the values of compliances used in calculations and provide two qualitatively different diagrams. A thermodynamic path for BT film grown onto particular substrate can be found using a plot of the room-temperature tetragonal distortion (c-a)/a as a function of misfit strain.

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