Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films

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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.
6 pages, 3 figures

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Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/132233

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0703439
 http://arxiv.org/abs/cond-mat/0703439
 doi:10.1103/PhysRevB.75.224116

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arXiv