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
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).
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