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Hydriding kinetics of the La1.5Ni0.5Mg17–H system prepared by mechanical alloying

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Abstract

In the study of reaction kinetics between hydrogen and hydriding alloys, what is the most important is to obtain intrinsic kinetic data. The hydriding kinetics of 0.5 g La1.5Ni0.5Mg17 sample in the two-phase (α-β) region was investigated as a function of temperature and pressure in the ranges 553–573 K and 0.256–0.992 MPa H2 respectively. Mathematical analyses of the time-dependent hydrogen absorption curves indicate agreement with Jander diffusion model, [1 − (1 − ξ)1/3]2 = k(T, P)t, which suggests that the rate-controlling step for hydrogen absorption is three-dimensional diffusion. An apparent activation energy for such diffusion process of 83 ± 1 kJ/mol H2 has been obtained from the absorption data.

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Authors and Affiliations

  1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China

    Qian Li, Kuo-Chih Chou, Qin Lin, Li-Jun Jiang & Feng Zhan

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  1. Qian Li
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  2. Kuo-Chih Chou
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  3. Qin Lin
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  4. Li-Jun Jiang
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  5. Feng Zhan
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Li, Q., Chou, KC., Lin, Q. et al. Hydriding kinetics of the La1.5Ni0.5Mg17–H system prepared by mechanical alloying. Journal of Materials Science 39, 6987–6991 (2004). https://doi.org/10.1023/B:JMSC.0000047542.93940.8c

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  • DOI: https://doi.org/10.1023/B:JMSC.0000047542.93940.8c

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