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Title: Thermodynamic and hydrogen-induced structural properties of Ho 1-xMmxCo2-hydrides
Authors: Srinivas, G.
Sankaranarayanan, V.
Ramaprabhu, S.
Keywords: Adsorption isotherms
Temperature distribution
Dehydrogenation cycles
Hydrogenation pressure
Sieverts-type apparatus
Holmium compounds
Issue Date: 2007
Citation: Journal of Physics D: Applied Physics, 40(4), 1183-1189
Abstract: Thermodynamic and hydrogen-induced structural properties of hydrogenated Ho1-xMmxCo2 (x ? 0, 0.1, 0.2, 0.3 and 0.4, Mm ? mischmetal) alloys have been investigated. The hydrogen absorption pressure-composition isotherms were studied in the temperature range 50-200 �C and pressure range 0.001-1 bar using a Sieverts-type apparatus. The effect of Mm on the equilibrium plateau pressure and hydride stability has been discussed. Structural analyses and hydrogen-induced amorphization of Ho 1-xMmxCo2hydrides were performed using powder x-ray diffraction. The structural stability of these alloys upon repeated hydrogenation and dehydrogenation cycles has been investigated. At lower hydriding pressure and temperatures, Ho1-xMmxCo 2-hydrides retain their Laves C15 structure; however, the large lattice volume expansion about 24% is observed in the ?-phase. The effect of hydrogenation pressure and temperature and Mm concentration on the hydrogen-induced transformation from crystalline Ho1-xMm xCo2-H to amorphous Ho1-xMmxCo 2-H and recrystallization into elemental hydrides have been studied and discussed. � 2007 IOP Publishing Ltd.
ISSN: 223727
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