Magnetic properties of commercial metal hydride battery materials

The magnetic properties of two commercial LaNi 5-based materials and their variation as a function of hydrogen cycles have been studied using magnetisation measurements. Pure LaNi 5 is a Pauli paramagnet, but it has been shown that after hydrogen cycling Ni clusters are formed on its surface. At roo...

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Bibliographic Details
Published in:Journal of alloys and compounds 1999-12, Vol.293, p.255-259
Main Authors: Broom, D.P, Kemali, M, Ross, D.K
Format: Article
Language:English
Subjects:
Hydrogen storage electrodes
LaNi 5
Magnetism
Metal hydrides
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Summary:The magnetic properties of two commercial LaNi 5-based materials and their variation as a function of hydrogen cycles have been studied using magnetisation measurements. Pure LaNi 5 is a Pauli paramagnet, but it has been shown that after hydrogen cycling Ni clusters are formed on its surface. At room temperature these clusters were found to act as superparamagnetic particles. Magnetisation curves have been obtained for a treated LaMM(Ni 3.43Mn 0.38Al 0.29Co 0.67) 4.77 sample and similar superparamagnetic behaviour has been identified. Measurements have also been made on a modified alloy, of commercial interest, at a range of high and low temperatures. This sample displays ferromagnetic, as well as paramagnetic and superparamagnetic, behaviour. It has been shown that the response at low field increases dramatically upon heating, demonstrating a large growth in the number of superparamagnetic particles present on its surface.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(99)00329-1