Oxygen permeation in bismuth-based materials part I: Sintering and oxygen permeation fluxes

Edouard Capoen (1, 2) , César Steil (1, 2) , Guy Nowogrocki (1, 2) , Marcin Malys (1, 2) , Caroline Pirovano (1, 2) , Axel Löfberg (2, 3) , Elisabeth Bordes-Richard (2, 3) , Jean-Claude Boivin (1, 2) , Gaetan Mairesse (1, 2) , Rose-Noëlle Vannier (1, 2)

1 LCPS - Laboratoire de cristallochimie et physicochimie du solide
2 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
3 LCL - Laboratoire de catalyse de Lille - UMR 8010

Oxygen permeation measurements were performed on two layered bismuth based oxide ceramics: a rhombohedral phase belonging to the Bi2O3-CaO system, (Bi2O3)0.73- (CaO)0.27 (BICAO) and a BICOVOX phase. Oxygen permeability for these systems was compared to permeability of the cubic fluorite type structure with composition (Bi2O3)0.75(Er2O3)0.25 (BE25). Low oxygen permeability was observed for the pure ceramic. As for BE25, permeability was considerably increased if 40 vol% of silver was added to BICAO. In contrast, permeability was not improved by addition of gold to BICOVOX. For this latter phase, the oxygen molecular exchange at the surface is clearly the limiting step in the oxygen transfer.

Mots clés: bismuth erbium oxide; bismuth calcium oxide; BIMEVOX; oxygen permeation

Domaines: Catalyse; Matériaux

Edouard Capoen, César Steil, Guy Nowogrocki, Marcin Malys, Caroline Pirovano, et al.. Oxygen permeation in bismuth-based materials part I: Sintering and oxygen permeation fluxes. Solid State Ionics, 2006, 177, pp.483-488. ⟨10.1016/j.ssi.2005.12.015⟩. ⟨hal-00071280⟩