caa a22 4500 463227255 CHVBK 20180405153230.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-0586-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0586-6 Hydriding properties of the nanocomposite 85wt.% Mg-15wt.% Mg2Ni0.8Co0.2 obtained by ball milling [Elektronische Daten] [Maria Khrussanova, Tsveta Mandzhukova, Eli Grigorova, Mitko Khristov, Pavel Peshev] The hydrogen sorption properties of the nanocomposite 85wt.% Mg-15wt.% Mg2Ni0.8Co0.2 obtained by mechanical alloying in inert atmosphere were investigated. Absorption measurements were performed under a hydrogen pressure P=1MPa at temperartures ranging from 373 to 573K, while desorption studies proceeded at P=0.15MPa and temperatures of 573 and 553K. The addition of the intermetallic compound Mg2Ni0.8Co00.2 was shown to improve the hydriding kinetics of magnesium. The composite exhibited a high hydrogen capacity which did not decrease even after a large number of absorption-desorption cycles. Comparison of the hydriding kinetics of the intermetallic compounds Mg2Ni and Mg2Ni0.8Co0.2 indicated facilitation of the process by the presence of cobalt in the alloy. Magnetic measurement data on Mg2Ni0.8Co0.2 showed formation of superparamagnetic precipitations of nickel and cobalt playing the role of active centres for dissociative chemisorption of hydrogen. The behaviour of the composite was explained by the catalytic effect of the intermetallic Mg2Ni0.8Co00.2, the existence of Ni and Co clusters on the surface and the process of mechanical alloying. Springer Science+Business Media, LLC, 2007 Khrussanova Maria Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut Mandzhukova Tsveta Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut Grigorova Eli Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut Khristov Mitko Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut Peshev Pavel Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3338-3342 0022-2461 42:10<3338 2007 42 10853 https://doi.org/10.1007/s10853-006-0586-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0586-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khrussanova Maria Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Mandzhukova Tsveta Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Grigorova Eli Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Khristov Mitko Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Peshev Pavel Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Building 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3338-3342 0022-2461 42:10<3338 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer