Significant decrease of hydride decomposition enthalpy in ordered Mg-In alloys induced by growing hydrogen concentration

0524960 - ÚFM 2021 RIV SK eng J - Journal Article
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
Significant decrease of hydride decomposition enthalpy in ordered Mg-In alloys induced by growing hydrogen concentration.
Kovové materiály. Roč. 58, č. 3 (2020), s. 161-167. ISSN 0023-432X. E-ISSN 1338-4252
R&D Projects: GA ČR(CZ) GA17-21683S
Institutional support: RVO:68081723
Keywords : hydrogen storage * Mg alloys * ordering * hydrides * ball milling
OECD category: Materials engineering
Impact factor: 1.068, year: 2020
Method of publishing: Open access
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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.
Permanent Link: http://hdl.handle.net/11104/0310352