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Characteristics of Hydrogen Absorption-Desorption Reaction in R-M (R=Y, La, Ce; M=Co, Rh, Ir, Ni, Pd, Pt) Binary Systems

Published online by Cambridge University Press:  11 February 2011

H. Mizutani ,
K. Hirano ,
J. Kadono ,
S. Nishiuchi ,
S. Yamamoto ,
T. Tanabe  and
J. Kawai
H. Mizutani
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, 606–8501 Kyoto, Japan.
K. Hirano
Affiliation:
Asahi Seiren Co. Ltd., 9 Ota, Yao, 581–0037 Osaka, Japan.
J. Kadono
Affiliation:
Kyoto Municipal Institute of Industrial Research, Shimogyo-ku, 600–8813 Kyoto, Japan.
S. Nishiuchi
Affiliation:
Kyoto Municipal Institute of Industrial Research, Shimogyo-ku, 600–8813 Kyoto, Japan.
S. Yamamoto
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, 606–8501 Kyoto, Japan.
T. Tanabe
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, 606–8501 Kyoto, Japan.
J. Kawai
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, 606–8501 Kyoto, Japan.
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Abstract

The amount of absorbed hydrogen, the absorption rate and the reversibility of hydrogen absorption-desorption reaction were measured for binary systems R-M (R= Y, La, Ce; M=Co, Rh, Ir, Ni, Pd, Pt). These experimental results were discussed by comparing the number of states unoccupied by electrons, the cohesive energy and the energy fluctuation, which were calculated by the extended Hückel method. The main results are as follows. (a) The more the number of unoccupied electronic states in the compounds, the more hydrogen is absorbed, (b) the critical concentrations of hydrogen in the R-M compounds where the energy fluctuation decreases remarkably correspond to the inflection or saturation points in the absorption curve, and (c) when the cohesive energy of a compound decreases linearly with hydrogen concentration, the compound easily desorbs hydrogen. On the other hand, when a sharp knickpoint is observed in the curve of cohesive energy - hydrogen concentration, the desorption reaction is hard to occur.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.53
Copyright
Copyright © Materials Research Society 2003

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References

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