Determination and interpretation of the hydriding and dehydriding kinetics in mechanically alloyed LaNiMg17 composite

The hydriding/dehydriding (H/D) rates in the two-phase (alpha-beta) region of LaNiMg17 were determined and investigated at temperature ranges from 523 to 623 K under approximately isobaric condition. The obtained data of H/D rates indicated that the rate-controlling step was the hydrogen diffusion t...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-01, Vol.387 (1-2), p.86-89
Main Authors: QIAN LI, CHOU, Kuo-Chih, XU, Kuang-Di, QIN LIN, JIANG, Li-Jun, FENG ZHAN
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Physics
Transport properties of condensed matter (nonelectronic)
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Summary:The hydriding/dehydriding (H/D) rates in the two-phase (alpha-beta) region of LaNiMg17 were determined and investigated at temperature ranges from 523 to 623 K under approximately isobaric condition. The obtained data of H/D rates indicated that the rate-controlling step was the hydrogen diffusion through the hydride phase. The new model developed by us has been used to these experiments, from which two formulae describing the H/D processes are obtained in an explicit analytic form. The corresponding activation energy is 71000 J/mole H2 for both processes. It can be seen that the theoretical calculation consists with the experimental data very well.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.06.034