New Insight into the Properties of Proton Conducting Oxides from Neutron Total Scattering

Details New Insight into the Properties of Proton Conducting Oxides from Neutron Total Scattering New Insight into the Properties of Proton Conducting Oxides from Neutron Total Scattering

2008-08-08

arxiv.org/abs/0808.1162v1

Physics

Condensed Matter

Materials Science

To pe published in ChemPhysChem

Scientific paper

In this paper we investigated the most important family of proton conducting oxides, i.e. cerates, by means of pair distribution function analysis (PDF) obtained from total neutron scattering data. The results clearly demonstrates that the local structure plays a fundamental role in the protonation process. Oxygen vacancy creation by acceptor doping reduces the local structure symmetry which is then restored upon water uptake. This mechanism mainly involves the Ba-O shell which flexibility seems to be at the basis of the proton conduction mechanism, thus providing a direct insight on the design of optimal proton conducting materials.

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