Structure and hydrogen storage properties of the hexagonal Laves phase Sc(Al1-xNix)2
2012 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 196, 132-137 p.Article in journal (Refereed) Published
The crystal structures of hydrogenated and unhydrogenated Sc(Al 1-xNi x) 2 Laves phases have been studied by combining several diffraction techniques and it is shown that hydrogen is situated interstitially in the A 2B 2-sites, which have the maximum number of scandium neighbours. The hydrogen absorption/desorption behaviour has also been investigated. It is shown that a solid solution of hydrogen forms in the mother compound. The hydrogen storage capacity exceeds 1.7 H/f.u. at 374 K, and the activation energy of hydrogen desorption was determined to 4.6 kJ/mol H 2. It is shown that these compounds share the same local coordination as Frank-Kasper-type approximants and quasicrystals, which opens up the possibility of finding many new hydride phases with these types of crystal structures.
Place, publisher, year, edition, pages
2012. Vol. 196, 132-137 p.
Hydrogen storage, Metal hydrides, X-ray diffraction, Approximants, Diffraction techniques, Hydrogen absorption, Hydrogen desorption, Hydrogen forms, Hydrogen storage capacities, Hydrogen storage properties, Laves phasis, Laves-phase, Local coordination, Mother compounds, New hydrides, Activation energy, Desorption, Hydrides, Hydrogen, X ray diffraction, Scandium
IdentifiersURN: urn:nbn:se:uu:diva-184879DOI: 10.1016/j.jssc.2012.06.002ISI: 000310394500019OAI: oai:DiVA.org:uu-184879DiVA: diva2:570959