Site preference of cobalt and deuterium in the structure of a complex AB sub 5 alloy electrode. A neutron powder diffraction study

The site preference of cobalt and deuterium in the charged and discharged state of a commercial-type metal hydride anode was investigated by high resolution neutron powder diffraction using an alloy with an altered isotope composition. In the alloy La( exp 58 Ni sub 0.376 exp 62 Ni sub 0.624 ) sub 3...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1999-01, Vol.146 (1), p.15-19
Main Authors: Vogt, T, Reilly, J J, Johnson, J R, Adzic, G D, McBreen, J
Format: Article
Language:English
Online Access:Get full text
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Summary:The site preference of cobalt and deuterium in the charged and discharged state of a commercial-type metal hydride anode was investigated by high resolution neutron powder diffraction using an alloy with an altered isotope composition. In the alloy La( exp 58 Ni sub 0.376 exp 62 Ni sub 0.624 ) sub 3.55 Co sub 0.75 Mn sub 0.33 Al sub 0.30 the isotope ratio of exp 58 Ni to exp 62 Ni leads to a zero neutron scattering length for nickel. Rietveld refinement revealed that Al and Mn occupy the midplane 3g sites of the CaCu sub 5 structure, while cobalt has a preference for 3g but also occupies the basal plane 2c sites. The space group of the deuteride remains P6/mmm which differs from the parent LaNi sub 5 D sub 7 which is P6 sub 3 mc.
ISSN:0013-4651