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Structure of a new ternary compound with high magnesium content, so-called Gd13Ni9Mg78

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCOUILLAUD, Samuel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGAUDIN, Etienne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorWEILL, François
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGOMEZ, Sonia
hal.structure.identifierInstitute of Physical Chemistry "Ilie Murgulescu"
dc.contributor.authorSTAN, Cristina
dc.contributor.authorPLANTÉ, Damien
hal.structure.identifierMatériaux, Rayonnements, Structure [NEEL - MRS]
dc.contributor.authorMIRAGLIA, Salvatore
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
dc.date.issued2012
dc.identifier.issn1359-6454
dc.description.abstractEnThe magnesium-rich composition Gd13Ni9Mg78 was synthesized from its constituent elements in sealed tantalum tubes in an induction furnace. X-ray diffraction, electron probe microanalysis and dark-field transmission electron microscopy (TEM) images revealed anewcompound with a composition ranging from Gd10-15Ni8-12Mg72-78 and low crystallinity. In order to increase the crystallinity, different experimental conditions were investigated for numerous compounds with the initial composition Gd13Ni9Mg78. In addition, several heat treatments (from 573 to 823 K) and cooling rates (from room temperature quenched down to 2 K h−1) have been tested. The best crystallinity was obtained for the slower cooling rates ranging from 2 to 6 K h−1. From the more crystallized compounds, the structure was partially deduced using TEM and an average cubic structure with lattice parameter a = 4.55 Å could be assumed. A modulation along both a∗ and b∗ axis with vectors of modulation q1 = 0.42a∗ and q2 = 0.42b∗ was observed. This compound, so-called Gd13Ni9Mg78, absorbs around 3 wt.% of hydrogen at 603 K, 30 bars and a reasonable degree of reversibility is possible, because after the first hydrogenation, irreversible decomposition into MgH2, GdH2 and NiMg2H4 has been shown. The pathway of the reaction is described herein. The powder mixture after decomposition shows an interesting kinetics for magnesium without ball milling.
dc.language.isoen
dc.publisherElsevier
dc.subject.enHydrogen storage
dc.subject.enRare-earth intermetallics
dc.subject.enMagnesium
dc.subject.enNanocrystallite
dc.title.enStructure of a new ternary compound with high magnesium content, so-called Gd13Ni9Mg78
dc.typeArticle de revue
dc.identifier.doi10.1016/j.actamat.2012.04.012
dc.subject.halChimie/Matériaux
bordeaux.journalActa Materialia
bordeaux.page4144-4151
bordeaux.volume60
bordeaux.issue10
bordeaux.peerReviewedoui
hal.identifierhal-00702386
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00702386v1
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