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Applied Physics Letters / Volume 89 / Issue 1 / INTERDISCIPLINARY AND GENERAL PHYSICS

Appl. Phys. Lett. 89, 014101 (2006); http://dx.doi.org/10.1063/1.2218328 (3 pages)

Hydrogen kinetics in magnesium hydride: On different catalytic effects of niobium

N. Bazzanella1, R. Checchetto1, A. Miotello1, C. Sada2, P. Mazzoldi2, and P. Mengucci3

1Dipartimento di Fisica, Università di Trento, Povo, I-38050 Trento, Italy
2Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
3Dipartimento di Fisica e Ingegneria dei Materiali e del Territorio, Università Politecnica delle Marche, I-60131 Ancona, Italy

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(Received 24 March 2006; accepted 26 May 2006; published online 5 July 2006)

The hydrogen desorption kinetics from pure and Nb-doped MgH2 samples was studied as function of the Nb concentration (6×10−4<[Nb/Mg]<5×10−2). Structural and kinetics analyses indicate that Nb acts as catalyst both when Nb atoms aggregate forming NbH clusters dispersed in the MgH2 and also when Nb is contained as atomic impurity. It is suggested that the local atomic environment around the Nb atom acts as seed for h-Mg phase nucleation which constitutes the rate limiting step for the hydrogen kinetics while, when the Nb concentration exceeds about 1 at. %, the rate limiting step is hydrogen diffusion.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

niobium, magnesium compounds, catalysis, desorption, doping profiles, aggregation, impurities, nucleation, diffusion, reaction kinetics

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2218328

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. F. Pelletier, J. Huot, M. Sutton, R. Schulz, A. R. Sandy, L. B. Lurio, and S. G. J. Mochrie, Phys. Rev. B 63, 052103 (2001).

    N. Bazzanella, R. Checchetto, and A. Miotello, Appl. Phys. Lett. 85, 5212 (2004)APPLAB000085000022005212000001.

    R. Checchetto, N. Bazzanella, A. Miotello, R. S. Brusa, A. Zecca, and A. Mengucci, J. Appl. Phys. 95, 1989 (2004)JAPIAU000095000004001989000001.

    R. Checchetto, N. Bazzanella, A. Miotello, C. Maurizio, F. D'Acapito, P. Mengucci, G. Barucca, and G. Majni, Appl. Phys. Lett. 87, 061904 (2005)APPLAB000087000006061904000001.

    I. Chambouleyron, F. Fajardo, and A. R. Zanatta, Appl. Phys. Lett. 79, 3233 (2001)APPLAB000079000020003233000001.


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