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Preparation and characterization of mechanically alloyed AB(3)-type based material LaMg2Ni5Al4 and its solid-gaz hydrogen storage reaction

Abstract : We developed in the present paper the synthesis of a new AB(3)-type compound LaMg2Ni5Al4 by mechanical alloying (MA) process. X-ray diffraction analysis (XRD) was used to determine the structural properties and the phase evolution of the powder mixtures. Two different synthesis pathways have been investigated. The first starting from elemental metals and the second from a mixture of two binary compounds LaNi5 (CaCu5-type structure, P6/mmm space group) and Al(Mg) solid solution (cubic Fm-3 m space group). The results show multiphase alloys which contain LaMg2Ni5Al4 main phase with hexagonal PuNi3-type structure (R-3 m space group). Rietveld analysis shows that using a planetary ball mill, we obtain a good yield of LaMg2Ni5Al4 compound after 5 h of mechanical alloying for both synthesis pathways. TEM analysis confirmed XRD results. SEM-EDX analysis of the final product was in agreement with the nominal chemical formula. A setup of possible solid-gaz hydrogenation reaction will be described so far at the end of this work. Electrochemical results demonstrate evidence on hydrogen absorption in the AB(3) material and the discharge capacity was equal to 5.9 H/f.u.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03611454
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Soumis le : jeudi 17 mars 2022 - 10:42:36
Dernière modification le : vendredi 5 août 2022 - 11:23:44

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Hassen Jaafar, Luc Aymard, Walid Dachraoui, Arnaud Demortière, Mohieddine Abdellaoui. Preparation and characterization of mechanically alloyed AB(3)-type based material LaMg2Ni5Al4 and its solid-gaz hydrogen storage reaction. Journal of Solid State Chemistry, Elsevier, 2018, 260, pp.73-79. ⟨10.1016/j.jssc.2018.01.015⟩. ⟨hal-03611454⟩

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