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Macroscopic and microscopic kinetics of hydrogen in magnesium-rich compounds

Authors
Journal
Journal of the Less Common Metals
0022-5088
Publisher
Elsevier
Publication Date
Volume
123
Identifiers
DOI: 10.1016/0022-5088(86)90110-4

Abstract

Abstract An overview of the kinetic properties in magnesium-rich systems is proposed in this report and our results on “macroscopic” and “microscopic” diffusion in MgH 2 and in a mixed system of 12MgH 2 + LaH 2.8 are presented. We have obtained the diffusion coefficient D of the hydrogen in the MgH 2 phase using nuclear magnetic resonance and note that this coefficient is nearly independent of temperature in the range 300 K < T < 600 K. In contrast, the macroscopic hydrogen absorption shows different behaviour at different temperatures and the absorption is much slower in pure magnesium than in the mixed hydride. A consistent approach which accounts for all the above observations is presented.

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