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Hydriding kinetics of ball-milled nanocrystalline MgH2 powders

Published online by Cambridge University Press:  31 January 2011

Á. Révész ,
D. Fátay  and
T. Spassov
Á. Révész*
Affiliation:
Department of Materials Physics, Eötvös University, Budapest, H-1518, P.O.B. 32, Budapest, Hungary
D. Fátay
Affiliation:
Department of Materials Physics, Eötvös University, Budapest, H-1518, P.O.B. 32, Budapest, Hungary
T. Spassov
Affiliation:
Department of Chemistry, University of Sofia “St.Kl.Ohridski,” 1164 Sofia, Bulgaria
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

MgX-ray diffraction (XRD)Kinetics
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 11 , November 2007 , pp. 3144 - 3151
Copyright
Copyright © Materials Research Society 2007

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