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Microstructural characterisation by X-ray scattering of perovskite-type La0.8Sr0.2MnO3±d thin films prepared by a dip-coating process

Lenormand, Pascal and Lecomte, André and Laberty-Robert, Christel and Ansart, Florence and Boulle, Alexandre Microstructural characterisation by X-ray scattering of perovskite-type La0.8Sr0.2MnO3±d thin films prepared by a dip-coating process. (2007) Journal of Materials Science, vol. 42 (n° 12). pp. 4581-4590. ISSN 0022-2461

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Official URL: http://dx.doi.org/10.1007/s10853-006-0560-3

Abstract

The La0.8Sr0.2MnO3 (LSM) cathode materials are widely used in solid oxide fuel cells (SOFCs) as electronic conductors. In such materials, the reduction of oxygen is located at the triple contact boundaries: air/cathode LSM/electrolyte which is generally Yttria Stabilised Zirconia (YSZ). In order to improve the chemical reactions at these air/cathode LSM/electrolyte interfaces, the triple phase boundary length has to be optimised. In this aim, we have first synthesised the La0.8Sr0.2MnO3 phase by a sol–gel route and, second, LSM thin films have been deposited on various polished substrates by using a dip-coating process. The structure and microstructure of the resulting LSM thin layers have been investigated by using well suited complementary techniques such as X-ray reflectometry, grazing incidence small angle X-ray scattering, Xray diffraction and scanning electronic microscopy. The structural and microstructural parameters of LSM thin films have been managed and studied as a function of synthesis parameters such as initial metallic salt concentration, time and temperature of annealing. The higher the metallic salt concentration, the higher the thickness of the film, the smaller the film density.The as-prepared layers are amorphous and the single crystallised perovskite form is obtained for low temperature heat treatments. Therefore, the annealed coatings are constituted by randomly oriented LSM nanocrystals, which organise in a more or less dense close-packed microstructure according to the initial metallic salt concentration.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The definitive version is available at http://www.springerlink.com The original PDF of the article can be found at Journal of Materials Science website : http://www.springerlink.com/content/100181/?p=94b99fe2aba845378d54df254ecb1029&pi=0
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Limoges - UNILIM (FRANCE)
Other partners > Ecole Nationale Supérieure de Céramique Industrielle - ENSCI (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:07 May 2009 14:12

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