Hydrogen sorption properties of mechanically alloyed Mg1-2xFexTix powder mixtures

JOURNAL OF ALLOYS AND COMPOUNDS

卷:611

Article

Meyer, M.¹  Mendoza-Zelis, L.¹ 

[1] Univ Nacl La Plata, Fac Ciencias Exactas, IFLP, Dept Fis, RA-1900 La Plata, Argentina

关键词: Metallic hydrides;    Hydrogen storage;    Mechanical alloying;    Mossbauer spectroscopy;   

DOI  :  10.1016/j.jallcom.2014.05.105

来源: Elsevier

【 摘 要 】

We report an investigation on the hydrogen sorption properties of mechanically alloyed systems of nominal composition Mg1-2xFexTix (x = 0.10, 0.15 and 0.20). The starting metallic powder mixtures were milled in H-2 ambient, till a steady state with no further H-2 absorption was attained. The resulting samples were then characterized and submitted to several H-2 discharge-charge cycles in order to determine their hydrogen sorption properties. With the aim to investigate the dependence of these properties on the sample microstructure we also studied samples of nominal composition Mg80Fe10Ti10 obtained through different processing routes. In those samples the Fe and Ti additives were added as a fine powder mixture or as the intermetallic compound FeTi while their mechanical alloying with Mg was conducted under H-2 or Ar atmosphere. All the samples were characterized by X-ray diffraction and Mossbauer spectroscopy on Fe-57, before and after their cycling in H-2. The results are analyzed in the framework of possible mechanisms for the transition metals catalytic action on the H-2 sorption processes and the influence of the sample microstructure. (C) 2014 Elsevier B. V. All rights reserved.

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