Kinetics and thermodymamics of hydrogen absorption in the Zr(Al0.1Fe0.9)2 intermetallic compound

A. Israel, I. Jacob

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Thermodynamic and kinetic characteristics of hydrogen absorption in Zr(Al0.1Fe0.9)2 were investigated at pressures up to 80 atm of H2 and temperatures between 248 K and 270 K. The heat and entropy of formation of the Zr(Al0.1Fe0.9)2 hydride are estimated to be -24.7 kJ/(mole H2) and -120 J/(K*mole H2), respectively. Small, well-defined samples were utilized for the kinetic research. The experimental kinetic data fit a shrinking core (sc) model, in accord with a visual examination of partly hydrided samples. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the hydride formation rate-determining step. The activation energy for the hydriding process is estimated from Arrhenius plots of the reaction rates to be 0.30 eV/H atom. The kinetic data are discussed in view of similar results for additional intermetallic compounds.

Original languageEnglish
Pages (from-to)131-134
Number of pages4
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - 1 Jan 1997


  • Hydride formation
  • Thermodynamic and kinetic parameters
  • Zr(AlFe)2

ASJC Scopus subject areas

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


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