Thermodynamic and structural aspects of hydrogen absorption in the Zr(AlxFe1-x)2 system

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

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Hydrogen desorption isotherms have been measured for Zr(AlxFe1-x)2 (0.12≤x≤0.4) compounds at pressures up to 60 atm and temperatures between -30°C and 140°C. The enthalpies of hydride formation, derived from the temperature variation of the equilibrium pressures for x=0.12, 0.167, 0.2 and 0.4, show an increase of the hydride stability with increase of x. The shapes of the isotherms in the plateau regions indicate decrease of the critical temperature for the metal-to-hydride transition as a function of x. These two features closely resemble the observations for the recently investigated Zr(AlxCo1-x)2 system and support further a proposed explanation for the anomalous hydrogen sorption behavior in these and other Al-containing intermetallics. No hysteresis between absorption and desorption isotherms was observed for the x=0.12 and 2/12 compounds. The lattice constants of the expanded crystal structures upon hydrogenation have been determined by employing X-ray diffraction.

Original languageEnglish
Pages (from-to)180-183
Number of pages4
JournalJournal of Alloys and Compounds
Volume351
Issue number1-2
DOIs
StatePublished - 10 Mar 2003

Keywords

  • Gas-solid reactions
  • Hydrogen absorbing materials
  • Metal hydrides
  • Transition metal compounds

ASJC Scopus subject areas

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

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