Mechanical synthesis of Mg6Pd1-xAgx alloys and their hydrogen absorption capability

In the present paper, we report the result of interactions between mechanically alloyed Mg6Pd1-xAgx alloys and hydrogen. Five Mg6Pd1-xAgx (x = 0, 0.1, 0.3, 0.5, and 0.7) alloys were selected to determine the possi-bility of substituting palladium with silver and determining the ability of such alloys to interact with hy-drogen. Their structures were studied with an X-ray diffraction (XRD) analysis. The XRD analysis confirmed the existence of a single Mg6Pd - type phase for samples with silver concentrations reaching x = 0.5. A higher silver content resulted in a two-phase mixture with a dominating epsilon Mg25.04Ag7.96 phase. The kinetics of the hydrogenation process were determined with a Sievert-type sorption analyzer. A partial substitution of palladium with silver in the Mg6Pd1-xAgx alloys made the hydrogen sorption kinetics slightly better than those of a pure Mg6Pd intermetallic phase and pure magnesium; however, the hydrogen content was lower. The hydride decomposition temperature and the synthesized hydride kinetic properties were investigated by differential scanning calorimetry (DSC) with thermogravimetric analysis (TGA). The influence of silver on the decomposition kinetics was noticeable. (c) 2023 Elsevier B.V. All rights reserved.