Pressure and temperature dependence of hydriding kinetics in massive Zr(AlxFe1-x)2 samples, x = 0.2, 0.5

M. Bereznitsky, I. Jacob, J. Bloch, M. H. Mintz

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3 Scopus citations


The hydriding kinetics of the Zr(AlxFe1-x) 2, x = 0.2, 0.5, compounds was monitored for massive rectangular parallelepiped samples utilizing hydrogen pressures up to 80 atm and temperatures between 238 and 353 K (1 atm = 101 325 Pa). The self-heating effects were sufficiently low under these conditions to enable approximately isothermal conditions for the kinetic experiments. The experimental data were fitted to a shrinking core model. The hydrogenations of some samples were observed in real time, utilizing a video camera and specially designed experimental system. The apparent activation energies, Ea, for each compound are derived from the temperature dependence of the reaction rate constants at given P/Peq ratios, where P is the applied experimental hydrogen pressure and Peq is the equilibrium pressure at a given temperature. Combination of the present results with a previous one for Zr(Al0.1Fe0.9)2 indicates a minimum of E a at the x = 0.2 compound. This behavior is explained in view of the atomic vibrational properties across the Zr(AlxFe1-x) 2 system.

Original languageEnglish
Pages (from-to)208-213
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - 28 Jan 2004


  • Gas-solid reactions
  • Hydrogen absorbing materials
  • Kinetics
  • Metal hydrides

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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