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La3TaO7 derivatives with Weberite structure type: Possible electrolytes for solid oxide fuel cells and high temperature electrolysers

Preux, Nicolas and Rolle, Aurélie and Merlin, Cindy and Benamira, Messaoud and Malys, Marcin and Estournès, Claude and Rubbens, Annick and Vannier, Rose-Noëlle La3TaO7 derivatives with Weberite structure type: Possible electrolytes for solid oxide fuel cells and high temperature electrolysers. (2010) Comptes Rendus Chimie, vol. 13 (n° 11). pp. 1351-1358. ISSN 1631-0748

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Official URL: http://dx.doi.org/10.1016/j.crci.2010.07.009

Abstract

In this study, with the aim to enhance the ionic conduction of known structures by defect chemistry, the La2O3-Ta2O5 system was considered with a focus on the La3TaO7 phase whose structure is of Weberite type. In order to predict possible preferential substitution sites and substitution elements, atomistic simulation was used as a first approach. A solid solution La3−xSrxTaO7−x/2 was confirmed by X-ray diffraction and Raman spectroscopy; it extends for a substitution ratio up to x = 0.15. Whereas La3TaO7 is a poor oxide ion conductor (σ700 °C = 2 × 10−5S.cm−1), at 700 °C, its ionic conductivity is increased by more than one order of magnitude when 3.3% molar strontium is introduced in the structure (σ700 °C = 2 × 10−4S.cm−1).

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Comptes Rendus Chimie website : http://www.sciencedirect.com/science/journal/16310748
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Lille 1, Sciences et Technologies - Lille 1 (FRANCE)
Other partners > Warsaw University of Technology (POLAND)
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Deposited By:Leila Abdelouhab

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