Site occupation disorder and hydrogen sorption properties of pseudo-AB 2 compounds: REMgNi(4-x)Alx with RE = La, Ce, Gd

J. G. Roquefere, J. L. Bobet, B. Chevalier, Etsuo Akiba, K. Asano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The compounds RENi4Mg have been elaborated by mechanical alloying (MA) and a subsequent heat treatment at 600°C for 1 hour. The lattice parameters are in good agreement with those already reported: 7.165 Å for LaNi 4Mg, 7.030 Å for CeNi4Mg and 7.038 Å for GdNi4Mg. The hydrogen sorption behaviours are strongly influenced by the rare earth used: for La compound, hydrogen absorption leads to a structural change and no desorption can be observed, for Ce compound, no reaction towards hydrogen can be noticed and for Gd compound, hydrogen can be absorbed and desorbed reversibly at room temperature. Moreover for GdNi4Mg, no structural change is reported and only a slight volume expansion can be noticed (e.g. 5%). The MA process has also been used successfully for the elaboration of GdNi4-xAlxMg up to x = 1. In these substituted compounds, hydrogen can also been absorbed and desorbed reversibly at room temperature.

Original languageEnglish
Title of host publication16th World Hydrogen Energy Conference 2006, WHEC 2006
Pages2853-2862
Number of pages10
Publication statusPublished - Dec 1 2006
Event16th World Hydrogen Energy Conference 2006, WHEC 2006 - Lyon, France
Duration: Jun 13 2006Jun 16 2006

Publication series

Name16th World Hydrogen Energy Conference 2006, WHEC 2006
Volume4

Other

Other16th World Hydrogen Energy Conference 2006, WHEC 2006
CountryFrance
CityLyon
Period6/13/066/16/06

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology

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  • Cite this

    Roquefere, J. G., Bobet, J. L., Chevalier, B., Akiba, E., & Asano, K. (2006). Site occupation disorder and hydrogen sorption properties of pseudo-AB 2 compounds: REMgNi(4-x)Alx with RE = La, Ce, Gd. In 16th World Hydrogen Energy Conference 2006, WHEC 2006 (pp. 2853-2862). (16th World Hydrogen Energy Conference 2006, WHEC 2006; Vol. 4).