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Neutron powder investigations of Zr0.85Ca0.15O1.85 sinter material at temperatures up to 1100K and with a simultaneously applied electric field

Journal of Applied Crystallography 30: 893-899

Autoren/Herausgeber: Kahlert H
Boysen H
Frey F
Erschienen: 1997

In sial neutron powder investigations of cubic stabilized zirconia [Zr0.85Ca0.15O1.85 (CSZ15)] sinter material were performed at room temperature without an applied direct-current electric field and at 1100K with and without an applied field, i.e. lasting ionic current. Experimental conditions (temperature, oxidizing atmosphere etc.) were chosen as close as possible to 'working conditions' of zirconia oxygen sensoric devices. To learn about field-induced structural changes and most probable ionic pathways, atomic displacement parameters were derived in the frame of a non-Gaussian Debye-Waller factor formalism for the oxygens. Probability-density-function maps and pseudo-potential (V-eff) maps indicate curved diffusion pathways of the oxygens close to the [100] directions. The action of the applied field is to lower the effective potential barriers.