Oxygen Vacancy Clusters in Pure and Doped CeO2-d


Oxide ceramics based on ceria, CeO2, have been the subject of considerable research for the role of solid electrolyte within solid oxide fuel cells (SOFCs), since their ionic conductivities at temperatures around 1000K are significantly higher than the current 'best' system, yttria-stabilised zirconia. However, under reducing conditions, such as those found at the anode side of an SOFC, the reduction of Ce4+ to Ce3+ gives rise to a significant electronic component to the conductivity which is detrimental to the operation of the fuel cell. This proposal aims to characterise the structural changes associated with the reduction process, using neutron diffraction data collected on Polaris as a function of oxygen partial pressure. Specifically, analysis of the total scattering will probe the development of defect clusters as the concentration of charge compensating oxygen vacancies increases.

DOI https://doi.org/10.5286/ISIS.E.24003178
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24003178
Creator Professor Paul Madden; Professor Sten Eriksson; Dr Steve Hull; Mr Dario Marrocchelli; Dr Stefan Norberg
Publisher ISIS Neutron and Muon Source
Publication Year 2012
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2008-04-21T07:58:44Z
Temporal Coverage End 2009-03-20T09:01:44Z