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Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 41: Poster SYM Hydrogen in Materials: New Developments

MM 41.11: Poster

Thursday, February 28, 2008, 18:00–20:00, Poster B

Formation and Hydrogen Reactivity of Complex Mg-Ni-La-(Co)-H phases — •Angelika Teresiak, Annett Gebert, Valentin Bunea, Jürgen Thomas, Jürgen Eckert, and Ludwig Schultz — Leibniz Institute for Solid State and Material Research Dresden,

Currently, Mg*Ni*RE(La) alloys are of great interest as new electrode materials for Ni-MH batteries. The recently discovered Mg2NiLaH7 hydride in the MgNiLaH quaternary system shows with 2,8 wt% (109 g/l H) a much higher hydrogen content than the well-known commercial LaNi5Hx- and TiV2Hx alloys.
In the present study we investigate the formation of the complex hydride Mg2NiLa(Co)H7*x by using various process routes, which aim at achieving material with nanocrystalline microstructure. The Mg2NiLaH7 forms completely by intensive ball milling of an inductively molten master alloy of Mg2NiLa under hydrogen for 7.5h. Also, the gradual electrolytic charging of the master alloy using a current density of −1mA/cm2 succeeded in forming the hydride. Starting from melt-spun amorphous ribbons, the crystallisation to nanocrystalline Mg2NiLa and a subsequent hydrogenation under 0.5MPa hydrogen for 26h were performed and monitored by means of in situ high temperature XRD. Furthermore, the influence of Co additives to Mg2NiLa on the phase formation and hydrogen absorption processes was studied.

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