La3TaO7 derivatives with Weberite structure type: Possible electrolytes for solid oxide fuel cells and high temperature electrolysers - Archive ouverte HAL Access content directly
Journal Articles Comptes Rendus. Chimie Year : 2010

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

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).
Fichier principal
Vignette du fichier
Preux_4725.pdf (622.32 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-01736265 , version 1 (01-02-2022)

Identifiers

Cite

Nicolas Preux, Aurélie Rolle, Cindy Merlin, Messaoud Benamira, Marcin Malys, et al.. La3TaO7 derivatives with Weberite structure type: Possible electrolytes for solid oxide fuel cells and high temperature electrolysers. Comptes Rendus. Chimie, 2010, 13 (11), pp.1351-1358. ⟨10.1016/j.crci.2010.07.009⟩. ⟨hal-01736265⟩
252 View
24 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More