Alloying of Mg/Mg2Ni eutectic by chosen non-hydride forming elements: Relation between segregation of the third element and hydride storage capacity

0369591 - ÚFM 2012 RIV CH eng J - Článek v odborném periodiku
Čermák, Jiří - Král, Lubomír
Alloying of Mg/Mg2Ni eutectic by chosen non-hydride forming elements: Relation between segregation of the third element and hydride storage capacity.
Journal of Power Sources. Roč. 197, č. 1 (2012), s. 116-120. ISSN 0378-7753. E-ISSN 1873-2755
Grant CEP: GA ČR GA106/09/0814; GA ČR(CZ) GAP108/11/0148
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: Energy storage materials * Hydrogen storage capacity * Metal hydrides
Kód oboru RIV: JG - Hutnictví, kovové materiály
Impakt faktor: 4.675, rok: 2012

Eutectic mixture Mg–11.3 at.% Ni was modified by elements X from the 13th (Al, Ga, In) and 14th group (Si, Ge, Sn and Pb). Phase analysis and distribution of X between primary solid solution Mg–Ni–X and Mg2Ni–X compound was carried out in stabilization annealed samples before hydrogen charging and in hydrided state. In the both states, it was found that X prefers Mg2Ni–X to Mg–Ni–X solid solution, and that the preference is stronger in the hydrided state. The effect is more pronounced for elements X from the 13th group. Suggested explanation was based on influence of X on the formation enthalpy of hydrides. It was observed that In increases the hydrogen storage capacity of the eutectic mixture. The most likely explanation is based on a strong segregation of In to phase Mg2Ni–X, and on a weak tendency of In to form phases with Mg and Ni.
Trvalý link: http://hdl.handle.net/11104/0203617