|Significant decrease of hydride decomposition enthalpy in ordered Mg-In alloys induced by growing hydrogen concentration|
CERMAK, J., KRAL, L., ROUPCOVA, P.
vol. 58 (2020), no. 3, pp. 161 - 167
Hydrogen sorption in four ball-milled Mg-xIn alloys (with x = 9, 61, 69, and 81 wt.%) was studied. It was found that pressure-concentration isotherms (PCI curves) of hydrogen desorption from disordered alloy (9 wt.% In) showed “ordinary“ appearance leading to a constant hydride decomposition enthalpy ΔH close to the value known for pure Mg; however, the plateaus of PCI’s obtained for desorption from ordered alloys (x > 9 wt.% In) were significantly upward-curved. Observed values of ΔH in ordered alloys were lower and decreased with increasing x and hydrogen concentration. Results were explained by size effect.
hydrogen storage, Mg alloys, ordering, hydrides, ball milling
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