Strain effect in PbTiO3/PbZr0.2Ti0.8O3 superlattices: From polydomain to monodomain structures - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2012

Strain effect in PbTiO3/PbZr0.2Ti0.8O3 superlattices: From polydomain to monodomain structures

Résumé

Ferroelectric symmetric superlattices consisting of alternating layers of PbTiO3 and PbZr0.2Ti0.8O3, were grown by pulsed laser deposition on SrTiO3 and SrRuO3-coated SrTiO3 substrates. The superlattices, with wavelengths K ranging from 20A ° to 200A ° , were analyzed using x-ray diffraction (h 2h diffraction scans, rocking curves, and reciprocal space mapping), high resolution transmission electron microscopy, and piezoforce scanning microscopy. For large-period superlattices, the strain is relieved by the formation of an a/c polydomain structure which propagates through the whole film. We investigate the influence of the wavelength on the a-domain volume fraction, the lattice parameters, the in-plane strain exx, and the mosaicity of the samples. We show that with decreasing the wavelength, a reduction of the a-domain volume fraction is observed as well as a reduced tensile in-plane strain and a lower mosaicity. A concomitant improvement of the local ferroelectric response is detected. Below a critical wavelength of about 30A ° and a critical sample thickness of 500A ° , the formation of 90 a/c domains is inhibited and the superlattices are completely c oriented. Thus the reduced wavelength induces compressive strain which dominates over the tensile clamping due to the thermal expansion mismatch between the substrate and the superlattice. This compressive strain favors a c-oriented structure in the PbTiO3/PbZr0.2Ti0.8O3 superlattices.

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Chimie
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Dates et versions

hal-00781862 , version 1 (28-01-2013)

Identifiants

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C. Hubault, C. Davoisne, Alexandre Boulle, L. Dupont, Valérie Demange, et al.. Strain effect in PbTiO3/PbZr0.2Ti0.8O3 superlattices: From polydomain to monodomain structures. Journal of Applied Physics, 2012, 112 (11), pp.114102-1-114102-10. ⟨10.1063/1.4767329⟩. ⟨hal-00781862⟩
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