Fast grain boundary oxygen ion diffusion in the α-phase of Bi2O3
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
The low temperature stable α-phase of pure Bi2O3 is known to have an oxygen ion diffusivity that is over 7 orders of magnitude lower than the high temperature fluorite-structured δ-phase. Tracer oxygen-18 diffusion studies of polycrystalline α-Bi2O3 at 600 °C using an ion microscope with lateral resolutions of ~ 50 nm for the surface distributions of the oxygen isotopes have resolved the secondary fast migration pathways as well as the normal bulk diffusion profile in the grains. A grain boundary pathway for the oxygen migration is distinguished from other extended defects, some of which are also active in the overall oxygen diffusivity. This experimental study highlights the potential manipulation of the micro-structure of this material for enhanced oxygen ion conduction in intermediate temperature solid oxide fuel cells as has been shown for perovskite MIEC electrode materials.
Date Issued
2016-08-16
Date Acceptance
2016-08-03
Citation
Solid State Ionics, 2016, 299, pp.89-92
ISSN
0167-2738
Publisher
Elsevier
Start Page
89
End Page
92
Journal / Book Title
Solid State Ionics
Volume
299
Copyright Statement
© 2016, Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Commission of the European Communities
Grant Number
PIEF-GA-2010-274730
Subjects
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Condensed Matter
Chemistry
Physics
Bismuth oxide
alpha-Phase
Fast oxygen migration
Grain boundary
Extended defects
KINETICS
0204 Condensed Matter Physics
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
Energy
Publication Status
Published