Sorption and desorption of hydrogen in the alloys based on the ErNi^sub 2^ compound

• Published in: Materials science (New York, N.Y.) Vol. 43; no. 5; p. 682
• Main Authors: Myakush, O V, Verbovyts'kyi, Yu V, Berezovets', V V, Ershova, O H, Dobrovol's'kyi, V D, Kotur, B Ya
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01-09-2007
• Subjects: Alloys; Amorphization; Desorption; Erbium; Heating rate; Hydrides; Hydrogen; Hydrogenation; Investigations; Laves phase; Materials science; Metals; Nickel compounds; Sorption; Spectrum analysis; Substitutes; Thermal stability; Yttrium
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-008-9014-1

We study the process of formation of pseudobinary Laves phases on the basis of the ErNi^sub 2^ compound realized as a result of the substitution of Y for Er and V for Ni and determine the hydrogen-sorption properties of these phases. The crystal structures of the original compounds and their saturated hydrides are investigated by the X-ray diffraction method. It is shown that these compounds absorb hydrogen under a pressure of 0.1-0.12 MPa without amorphization. The maximum hydrogen-sorption capacity (3.4 at. H/f.u.) is obtained for the Er^sub 0.85^Y^sub 0.15^Ni^sub 2^ compound. The thermal stability of hydrides is determined by the method of thermodesorption spectroscopy in gaseous hydrogen at a heating rate of 5°C / min. An insignificant substitution o Y for Er and V for Ni improves the parameters of hydrogen sorption and desorption for these compounds.