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

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

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

Hydrogen Utilization Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 GdNi_4-xAl_xMg up to x = 1. In these substituted compounds, hydrogen can also been absorbed and desorbed reversibly at room temperature.

Original language	English
Title of host publication	16th World Hydrogen Energy Conference 2006, WHEC 2006
Pages	2853-2862
Number of pages	10
Publication status	Published - Dec 1 2006
Event	16th World Hydrogen Energy Conference 2006, WHEC 2006 - Lyon, France Duration: Jun 13 2006 → Jun 16 2006

Publication series

Name	16th World Hydrogen Energy Conference 2006, WHEC 2006
Volume	4

Other

Other	16th World Hydrogen Energy Conference 2006, WHEC 2006
Country	France
City	Lyon
Period	6/13/06 → 6/16/06

All Science Journal Classification (ASJC) codes

Energy Engineering and Power Technology
Fuel Technology

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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)Al_x 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).

Site occupation disorder and hydrogen sorption properties of pseudo-AB ₂ compounds : REMgNi_(4-x)Al_x with RE = La, Ce, Gd. / Roquefere, J. G.; Bobet, J. L.; Chevalier, B.; Akiba, Etsuo; Asano, K.

16th World Hydrogen Energy Conference 2006, WHEC 2006. 2006. p. 2853-2862 (16th World Hydrogen Energy Conference 2006, WHEC 2006; Vol. 4).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Roquefere, JG, Bobet, JL, Chevalier, B, Akiba, E & Asano, K 2006, Site occupation disorder and hydrogen sorption properties of pseudo-AB ₂ compounds: REMgNi_(4-x)Al_x with RE = La, Ce, Gd. in 16th World Hydrogen Energy Conference 2006, WHEC 2006. 16th World Hydrogen Energy Conference 2006, WHEC 2006, vol. 4, pp. 2853-2862, 16th World Hydrogen Energy Conference 2006, WHEC 2006, Lyon, France, 6/13/06.

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

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 {\AA} for LaNi 4Mg, 7.030 {\AA} for CeNi4Mg and 7.038 {\AA} 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.",

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AU - Akiba, Etsuo

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N2 - 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.

AB - 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.

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