Abstract
We report here on powder mixtures, with nominal compositions Mg 7Zn and Mg 7Zn 3, which were ball milled (i) at room temperature in an inert Ar atmosphere, (ii) at liquid nitrogen temperature (cryomilling), and (iii) at room temperature in a reactive H 2 atmosphere (reactive milling). In all cases, ball milling results in the formation of an amorphous Mg–Zn phase with a likely composition of about Mg 45Zn 55. A fraction of Mg is left unreacted and transforms to MgH 2 if ball milling is carried out in a reactive H 2 atmosphere. Hydrogen-absorption (H-absorption) in a Sievert-type apparatus for the powders ball milled in Ar results in the partial conversion of the Mg into MgH 2. The amorphous Mg–Zn phase appears not to play any significant role in the hydrogen-sorption (H-sorption) behaviour and crystallizes into Mg 21Zn 25. The latter partially decomposes into MgH 2 and MgZn 2, provided the hydrogenation reaction is extended for sufficiently long times.
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