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Ren, W.
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Topics
Publications (9/9 displayed)
- 2020Oxygen octahedral tilt ordering in (Na1/2Bi1/2)TiO3 ferroelectric thin filmscitations
- 2018Graphitization of amorphous carbon by swift heavy ion impactscitations
- 2018Graphitization of amorphous carbon by swift heavy ion impacts : Molecular dynamics simulationcitations
- 2017In-situ X-ray computed tomography characterisation of 3D fracture evolution and image-based numerical homogenisation of concretecitations
- 2016In-situ X-ray computed tomography characterisation of 3D fracture evolution and image-based numerical homogenisation of concretecitations
- 2015Modification of Pt/Co/Pt film properties by ion irradiationcitations
- 2014Control of ferroelectricity and magnetism in multi-ferroic BiFeO3 by epitaxial straincitations
- 2014Control of ferroelectricity and magnetism in multi-ferroic BiFeO3 by epitaxial straincitations
- 2013Full field electron spectromicroscopy applied to ferroelectric materialscitations
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article
Oxygen octahedral tilt ordering in (Na1/2Bi1/2)TiO3 ferroelectric thin films
Abstract
Oxygen octahedra tilt (OOT) transition is the most common type of distortion in inorganic ABO<sub>3</sub> compounds with a perovskite crystal structure. The importance of OOT transitions is underlined by accompanying changes in the B-O and A-O bonding environments, which consequently affects the electronic states and hence influences electrical, magnetic, and superconducting properties of many perovskite compounds. In recent years, controlled manipulation of the OOT order in perovskite thin film ferroelectrics has been attempted through heteroepitaxial strain engineering. The current study demonstrates an alternative approach whereby OOT ordering in a 200 nm thick polycrystalline thin film of (Na<sub>1/2</sub>Bi<sub>1/2</sub>)TiO<sub>3</sub> (NBT) Pb-free ferroelectric is induced by applying electric-field along the 111 octahedral tilt axis, which is furthermore enabled by a strong (111) crystallographic texture normal to the film surface.<i> In situ</i> x-ray diffraction reveals that electric-field-induced OOT ordering proceeds through nucleation and rapid growth of domains with ordered a<sup>-</sup>a<sup>-</sup>a<sup>-</sup> tilting, followed by an increase in the tilt angle within the ordered domains.