Kinetics of hydride formation in massive LaNi5 samples

A. Osovizky, J. Bloch, M. H. Mintz, I. Jacob

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17 Scopus citations


The hydriding kinetics of parallelepiped, 50-200 mg LaNi5 samples were investigated as a function of temperature and pressure in the ranges 245-293 K and 5-70 atm H2 respectively. Mathematical analyses of the time-dependent hydrogen absorption curves indicate agreement with both shrinking core and low-dimensional nucleation and growth-type models. Visual and metallographic examinations of partially hydrided samples do not provide any additional evidence in support of either of the two hydriding models. The temperature dependence of the hydrogenation rate constants follows an Arrhenius-type behavior for a given driving force, determined by a constant ratio between the applied and equilibrium plateau hydrogen pressures. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the rate-determining step of hydride formation. The activation energy for the hydriding process is estimated as 0.37 eV/H atom. This value is independent of the applied model.

Original languageEnglish
Pages (from-to)168-178
Number of pages11
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - 15 Nov 1996


  • Hydride formation
  • Kinetics
  • LaNi
  • Massive intermetallic compounds

ASJC Scopus subject areas

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


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