TOPICAL DAY - Investigation of Oxide Ion Conduction via Neutron Scattering Techniques and Ab Initio Molecular Dynamcis
Mardi 6 juin 2017 10:50
- Duree : 45 minutes
Lieu : ILL 4, seminar room, 1st floor - 71 avenue des Martyrs - Grenoble
Orateur : Joseph PEET (Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France)
Oxide ion conductors are important materials in the field of energy research, acting as electrolytes in solid oxide fuel cells and providing clean and efficient conversion of chemical to electrical energy. Understanding of the atomic level diffusion pathways in these materials, and the relationship of these to the macroscopic conductivity is essential for future design of improved materials.
Quasielastic neutron scattering allows for direct experimental evidence of microscopic oxygen diffusion in these materials, providing timescales of diffusion processes as well as length scales of individual oxygen jumps. These can be compared to findings from ab-initio molecular dynamics simulations which provide the diffusion pathways themselves and also directly related back to macroscopic measurements of conductivity.
These techniques have been used in combination to create a picture of the atomic level diffusion processes occurring in several promising oxide ion conductors. Here results are presented from one such material, La2Mo2O9, in which dynamics are observed on the nanosecond timescale, the longest timescales observed in OICs to date.
Contact : tellier@ill.fr
Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Evènement répétitif : (General ILL Seminar - College 7)
Site de l'évènement : Polygone scientifique
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