Interaction of hydrogen with the β-Al3Mg2 complex metallic alloy: Experimental reliability of theoretical predictions

被引：17

作者：

Fernandez, J. F. ^{[1
]}

Leardini, F. ^{[1
]}

Bodega, J. ^{[1
]}

Sanchez, C. ^{[1
]}

Joubert, J. -M. ^{[2
]}

Cuevas, F. ^{[2
]}

Leroy, E. ^{[2
]}

Baricco, M. ^{[3
,4
]}

Feuerbacher, M. ^{[5
]}

机构：

[1] Univ Autonoma Madrid, Fac Ciencias, Dpto Fis Mat, E-28049 Madrid, Spain

[2] CNRS, ICMPE, F-94320 Thiais, France

[3] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy

[4] Univ Turin, NIS INSTM, I-10125 Turin, Italy

[5] Forschungszentrum Julich, Inst Mikrostrukturforsch, D-52425 Julich, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 472卷 / 1-2期

关键词：

Complex metallic alloys; Metal hydrides; Gas-solid reactions; Thermodynamic properties; X-ray diffraction; MAGNESIUM; SYSTEM; PHASE; STORAGE;

D O I：

10.1016/j.jallcom.2008.05.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper we report on some hydrogenation characteristics of beta-Al3Mg2. Pressure-composition-temperature (PCT) absorption curves were obtained in the temperature range 573-658 K up to 4 MPa of H-2-pressure. During the H-absorption process, (beta-Al3Mg2 disproportionates into MgH2 and the solid solution of Al(Mg). This reaction is reversible at the temperatures studied. The enthalpy and entropy of the reaction were determined from the Van't Hoff plot as -62(4) kJ/mol H-2 and -122(6)J/K mol H-2, respectively. A detailed analysis of the sample microstructure at several stages of the absorption and desorption processes has been carried out. The microstructure can be explained by hydrogen diffusion and the disproportionation/recombination reactions of the (3 phase. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：565 / 570

页数：6

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