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Modifications of the chemical and electronic ferroelectric surface structure under water adsorption

Abstract : The main objective of our research is to understand how the ferroelectric polarization affects the chemi/physisorption of H2O molecules on a ferroelectric surface and how this adsorption may in return affect the chemical and the atomic surface structure and hence the ferroelectric properties. The acquired knowledge may be used to obtain a deeper understanding of light enhanced hydrogen production at a ferroelectric surface, to promote the water photolysis reaction, by favoring the electron-hole separation and the surface reactivity. We have first studied the surface atomic and chemical structure of the model ferroelectric BaTiO3 (001) in the form of epitaxial thin films and single crystals before and after controlled exposure to water. The depolarizing field produced by the surface discontinuity leads to changes in the atomic, chemical and electronic structural changes and reordering. We have also demonstrated the existence of a ferroelectric, quasiamorphous, ultrathin BaTiO3 film. Finally, the surface structure of the uniaxial ferroelectric Sr0.67Ba0.33Nb2O6 (001) has been characterized in a first step towards use for photolysis enhancement.
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Contributor : Jiale Wang <>
Submitted on : Sunday, December 8, 2013 - 3:36:19 AM
Last modification on : Friday, May 29, 2020 - 3:58:35 PM
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  • HAL Id : tel-00915471, version 1

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Jiale Wang. Modifications of the chemical and electronic ferroelectric surface structure under water adsorption. Materials Science [cond-mat.mtrl-sci]. Université Pierre et Marie Curie - Paris VI, 2013. English. ⟨tel-00915471⟩

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