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LaMg11 with a giant unit cell synthesized by hydrogen metallurgy: Crystal structure and hydrogenation behavior / Roman V. Denys in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2510–2519 Titre : LaMg11 with a giant unit cell synthesized by hydrogen metallurgy: Crystal structure and hydrogenation behavior Type de document : texte imprimé Auteurs : Roman V. Denys, Auteur ; Andrey A. Poletaev, Auteur ; Jan Ketil Solberg, Auteur Année de publication : 2011 Article en page(s) : pp. 2510–2519 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Powder  processing  Synchrotron  X-ray  diffraction  Hydrides  Magnesium  alloys  Hydrogen  storage Résumé : We have successfully applied a hydrogen metallurgy synthesis to yield LaMg12−x intermetallic at 500 °C. During a vacuum thermal desorption from the LaH3–MgH2 nanocomposite prepared by reactive ball milling in H2, hydrogen desorption from the La dihydride occurred via a mechanism of cooperative phase transformation at temperatures being 400° lower than the desorption from pure LaH2. The crystal structure of the intermetallic was determined by synchrotron X-ray diffraction (SR XRD). The orthorhombic LaMg12−x has a giant unit cell, the volume of which exceeds 8000 Å3. In situ SR XRD studies showed the fine details of the hydrogen desorption process with several parallel and consecutive transformation steps. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008957 [article] LaMg11 with a giant unit cell synthesized by hydrogen metallurgy: Crystal structure and hydrogenation behavior [texte imprimé] / Roman V. Denys, Auteur ; Andrey A. Poletaev, Auteur ; Jan Ketil Solberg, Auteur . - 2011 . - pp. 2510–2519. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2510–2519 Mots-clés : Powder  processing  Synchrotron  X-ray  diffraction  Hydrides  Magnesium  alloys  Hydrogen  storage Résumé : We have successfully applied a hydrogen metallurgy synthesis to yield LaMg12−x intermetallic at 500 °C. During a vacuum thermal desorption from the LaH3–MgH2 nanocomposite prepared by reactive ball milling in H2, hydrogen desorption from the La dihydride occurred via a mechanism of cooperative phase transformation at temperatures being 400° lower than the desorption from pure LaH2. The crystal structure of the intermetallic was determined by synchrotron X-ray diffraction (SR XRD). The orthorhombic LaMg12−x has a giant unit cell, the volume of which exceeds 8000 Å3. In situ SR XRD studies showed the fine details of the hydrogen desorption process with several parallel and consecutive transformation steps. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008957