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Hydrogen cycling induced degradation in LaNi5-type materials

Joubert, J.-M.
Latroche, M.
Percheron-Guégan, A.
Published in Journal of alloys and compounds. 2002, vol. 330-332, p. 208-214
Abstract Defect generation in hydrogen cycled LaNi5 and substituted derivatives was studied in previous work by analysis of the X-ray line broadening. In the present work, the pulverization in the same samples is analyzed by granulometric measurements and scanning electron microscopy. Both phenomena correspond to irreversible degradation of the initial intermetallic compounds, as confirmed by first cycle hysteresis presence in pressure composition isotherms. They are analyzed in terms of the lattice expansion occurring at the discrete phase transition between α and β phases and measured by X-ray diffraction. This study shows that, in addition to this latter parameter, the limit of elasticity and the resistance to rupture must be considered.
Keywords Hydrogen storage materialsIntermetallicsGas-solid reactionsDislocations and disclinationsX-ray diffraction
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Research group Groupe Cerny
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JOUBERT, J.-M. et al. Hydrogen cycling induced degradation in LaNi5-type materials. In: Journal of alloys and compounds, 2002, vol. 330-332, p. 208-214. doi: 10.1016/S0925-8388(01)01640-1 https://archive-ouverte.unige.ch/unige:35653

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Deposited on : 2014-04-14

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