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Latin American applied research
Print version ISSN 0327-0793On-line version ISSN 1851-8796
Abstract
G. URRETAVIZCAYA; G. GARCIA; D. SERAFINI and G. MEYER. Mg-Ni alloys for hydrogen storage obtained by ball milling. Lat. Am. appl. res. [online]. 2002, vol.32, n.4, pp.289-294. ISSN 0327-0793.
The effect of the atmosphere and milling time on the structural, morphological and hydrogen reactivity properties of the mechanically alloyed Mg-Ni system is studied. Nanocrystalline Mg2Ni formed by ball milling in argon exhibits a higher thermal stability than the metals amorphized by milling during shorter times. It is shown that the initially fast hydrogen absorption kinetics of Mg2Ni at 250°C strongly depends on the crystallinity degree. When the Mg-Ni mixture is mechanically alloyed under hydrogen atmosphere, MgH2 is formed at first and Mg2NiH4 is obtained later. Samples prepared in argon show a higher hydrogen absorption capacity than those obtained in hydrogen.
Keywords : Mg-Ni; Metallic hydrides; Mechanical alloying; Hydrogen absorption.