H--jump diffusion in barium-nitride-hydride Ba2NH

Altorfer, F., Bührer, W., Winkler, B., Coddens, G., Essmann, R. and Jacobs, H. (1994) H--jump diffusion in barium-nitride-hydride Ba2NH Solid State Ionics, 70-71 (Part 1). pp. 272-277. DOI 10.1016/0167-2738(94)90322-0.

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Abstract

Barium-nitrade-hydride is one of the few documented H--ionic conductors. It crystallises in the [alpha]-NaFeO2-structure (space group R m) with distorted Ba-octahedra centred alternately by H- and N3-. Neutron diffraction shows that the hydrogen ions are distributed independent of temperature over lattice sites: 85% on (3a) and 15% on (6c). At T > 525 K a sharp increase of the ionic conductivity can be observed. The diffusion process takes place by uncorrelated jumps of hydrogen ions between regular lattice sites. Using quasielastic neutron scattering techniques and a planar jump diffusion model, we were able to determine the mean residence time [tau] on a H--site to be [tau]=20±2ps and the diffusion constant D to be 2.1±0.3×10-5 cm2/ /s at T=823 K.

Document Type: Article
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
DOI etc.: 10.1016/0167-2738(94)90322-0
ISSN: 0167-2738
Date Deposited: 02 Feb 2012 09:37
Last Modified: 10 Oct 2012 10:01
URI: http://eprints.uni-kiel.de/id/eprint/15587

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