Kinetics of hydrogen absorption by yttrium dihydride powder

The kinetics of hydrogen absorption by a powder of yttrium dihydride is investigated. A sample having a known specific surface area and a composition close to the lower concentration boundary of the homogeneity region of dihydride is saturated with hydrogen in a Siverts apparatus at 300–450°C and hy...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2011-02, Vol.52 (1), p.125-127
Main Authors: Levinsky, Yu. V., Patrikeev, Yu. B., Filyand, Yu. M.
Format: Article
Language:English
Subjects:
Application of Powdered Materials and Functional Coatings
Boundaries
Chemistry and Materials Science
Curvature
Dihydrides
Homogeneity
Hydrogen storage
Materials Science
Mathematical analysis
Metallic Materials
Nonferrous metals
Yttrium
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Summary:The kinetics of hydrogen absorption by a powder of yttrium dihydride is investigated. A sample having a known specific surface area and a composition close to the lower concentration boundary of the homogeneity region of dihydride is saturated with hydrogen in a Siverts apparatus at 300–450°C and hydrogen pressures of 5–45 kPa. The diffusivities of hydrogen ( D H ) are evaluated on the basis of absorption kinetic curves using a previously developed technique based on the possibility of ignoring the surface curvature at degrees of saturation tending to zero. The temperature dependence of D H (m 2 /s) in the range of 300–450°C is log D H = −12.7 − 1770/T.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821211010123