ROQUEFERE, Jean-Gabriel; MATAR, Samir F.; BOBET, Jean-Louis

doi:10.1016/j.ijhydene.2010.05.091

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ROQUEFERE, Jean-Gabriel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MATAR, Samir F.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BOBET, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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International Journal of Hydrogen Energy. 2010, vol. 35, n° 15, p. 7858-7865

Elsevier

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YMgNi4H4 and GdMgNi4H4 hydrides were studied from first principles. Starting from the experimental crystallographic values, the Equation Of State (EOS) of the intermetallics as well as the hydrides have been established. Considering the two possible structures reported for such pseudo Laves phase hydrides (i.e. cubic and orthorhombic), the relative stabilities of the hydrides have been compared. The orthorhombic configuration is confirmed for REMgNi4H4 (RE = Y, Gd) as seen experimentally. Nevertheless, in a larger cell (i.e. REMgNi4−xAlx solid solution), it has been shown experimentally that the hydride remains cubic, and the present calculations show that the hydrogen atoms have to be considered within the [RENi3] tetrahedrons.< Réduire

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Stability of the hydrides REMgNi<sub>4</sub>H<sub>4</sub> (RE = Y, Gd) from first principles

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