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The Landau theory of phase transitions of Ba0.8Sr0.2TiO3 thin film underexternal electric field applied in the planar geometry is developed. Theinterfacial van-der-Waals field Ez=1.1x10^8 V/m oriented normal to thefilm-substrate interface was introduced in to the model calculation to explainexperimentally observed behavior of the polarization as a function of planarelectric field. The Ez - misfit strain phase diagram of the film is constructedand discussed.

Polarization of thin films of barium-strontium titanate under external electric field