[Kovove materialy - Metallic materials]
    Thu - October 29, 2020 - 19:54 No. of hits : 1186687 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 58 (2020), Issue 3

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

Abstract
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.

Key words
hydrogen storage, Mg alloys, ordering, hydrides, ball milling

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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