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Hydriding kinetics of ball-milled nanocrystalline MgH2 powders

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Abstract

The kinetics of hydride formation and decomposition described by semiempirical models generally do not involve particle and grain-size dependence. However, ball-milled nanocrystalline powders usually exhibit log-normal grain-size and particle-size distribution. Considering size dependence, a total reacted function for a multiparticle system has been developed. We show that the shape of the measured reaction fraction curves do not determine unambiguously the rate-controlling mechanism of hydrogen sorption, since the kinetics are strongly affected by the microstructure. With the application the convolutional multiple whole profile fitting procedure for nanocrystalline MgH2, the parameters, e.g., the median and variance of the log-normal grain-size distribution have been determined. Taking these values into account, the reaction constants corresponding to different sorption states are considerably modified compared with values obtained from classical single-particle models.

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ACKNOWLEDGMENTS

The work has been supported by the National Research and Development Fund (3A-058/04) and by the Bulgarian Scientific Research Fund under Grant BYX-14/05. The authors acknowledge the assistance of G. Ribárik in the evaluation of the XRD profiles.

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Authors and Affiliations

  1. Department of Materials Physics, Eötvös University, Budapest, H-1518, P.O.B. 32, Budapest, Hungary

    Á. Révész & D. Fátay

  2. Department of Chemistry, University of Sofia “St.Kl.Ohridski,”, 1164, Sofia, Bulgaria

    T. Spassov

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  1. Á. Révész
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  2. D. Fátay
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  3. T. Spassov
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Correspondence to Á. Révész.

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Révész, Á., Fátay, D. & Spassov, T. Hydriding kinetics of ball-milled nanocrystalline MgH2 powders. Journal of Materials Research 22, 3144–3151 (2007). https://doi.org/10.1557/JMR.2007.0387

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  • DOI: https://doi.org/10.1557/JMR.2007.0387

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