First principles investigations of the hydrogenation effects on the electronic structure and the chemical bonding of CeIrAl
Langue
en
Article de revue
Ce document a été publié dans
Solid State Sciences. 2011, vol. 13, n° 9, p. 1704-1708
Elsevier
Résumé en anglais
Hydrogenation of CeIrAl, leading to CeIrAlH<sub>2</sub>, induces both changes of the crystal and electronic structure that we address within the density functional theory. The ab initio positioning of hydrogen leads to its ...Lire la suite >
Hydrogenation of CeIrAl, leading to CeIrAlH<sub>2</sub>, induces both changes of the crystal and electronic structure that we address within the density functional theory. The ab initio positioning of hydrogen leads to its coordination within Ce<sub>3</sub>Ir tetrahedra and allows reproducing and interpreting the experimental findings of a Ce valence change from intermediate to trivalent in CeIrAlH<sub>2</sub> through the bonding of hydrogen with Ce and Ir. From Bader analysis of the charge density, hydrogen carries a charge of −0.39 and is found from energy differences to be weakly and covalently bonded in the intermetallic substructure. The results allow assessing the reversibility of hydrogen absorption/desorption in CeIrAl.< Réduire
Mots clés en anglais
Hydrogen
Intermetallics
DFT
Chemical bonding
Electronic structures
Bader
Origine
Importé de halUnités de recherche