Coupling in situ synchrotron radiation with ex situ spectroscopy characterizations to study the formation of Ba1−xSrxTiO3 nanoparticles in supercritical fluids - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Supercritical Fluids Année : 2014

Coupling in situ synchrotron radiation with ex situ spectroscopy characterizations to study the formation of Ba1−xSrxTiO3 nanoparticles in supercritical fluids

Résumé

High quality barium strontium titanate (BaxSr1 − xTiO3 with 0 ≤ x ≤ 1-BST) nanoparticles can be synthesized using supercritical fluids technology. Well crystallized particles of 20 nm with a narrow size distribution were produced in a single step. The reaction is achieved at relatively low temperature (T < 400 °C) and in tens of seconds. The combination of in situ synchrotron wide angle X-ray scattering (WAXS) and ex situ analyses in the form of Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM) leads to an understanding of the influence of the substitution of barium cations with strontium ones on the BST nanoparticle growth. A correlation between particle size, density of -OH groups at the surface of the particles and BST composition is exhibited; the higher the -OH density and the lower the strontium concentration, the larger the particles. This confirms that the formation of BST nanoparticles in supercritical fluids is governed by a sol-gel mechanism.

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Matériaux
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Dates et versions

hal-00956772 , version 1 (07-03-2014)

Identifiants

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Gilles Philippot, Kirsten M.Ø. Jensen, Mogens Christensen, Catherine Elissalde, Mario Maglione, et al.. Coupling in situ synchrotron radiation with ex situ spectroscopy characterizations to study the formation of Ba1−xSrxTiO3 nanoparticles in supercritical fluids. Journal of Supercritical Fluids, 2014, 87, pp.111-117. ⟨10.1016/j.supflu.2013.12.009⟩. ⟨hal-00956772⟩
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