Lattice contraction of cerium hydrides from first-principles LDA + U calculations
In: International Journal of Hydrogen Energy, Jg. 37 (2012-03-15), Heft 6, S. 5108-5113
academicJournal
Zugriff:
Abstract: Ce can be loaded with H forming complicated continuous solid solution and compounds, and causing remarkable electronic-structure changes. First-principles pseudopotential plane wave method with adding a Hubbard parameter U for considering the strong Coulomb correlation between localized 4f electron is employed to investigate the electronic and structural properties of stoichiometric and nonstoichiometric face-centered cubic (fcc) Ce hydrides (CeH x , x = 2, 2.25, 2.5, 2.75 and 3, respectively.). The most remarkable result is the decreasing trend of the calculated lattice parameters with increasing H composition, which is resulted from the associated effects of the enhanced chemical bonding owing to the participation of Ce 5d electron and, the size effects owing to the small H atomic radius and the large volume of octahedral interstice thus in favor of reducing the atomic distance for the formation of chemical bonding between Ce and octahedral H atoms. [Copyright &y& Elsevier]
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Lattice contraction of cerium hydrides from first-principles LDA + U calculations
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Autor/in / Beteiligte Person: | Ao, B.Y. ; Wang, X.L. ; Shi, P. ; Chen, P.H. ; Ye, X.Q. ; Lai, X.C. ; Ai, J.J. ; Gao, T. |
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Zeitschrift: | International Journal of Hydrogen Energy, Jg. 37 (2012-03-15), Heft 6, S. 5108-5113 |
Veröffentlichung: | 2012 |
Medientyp: | academicJournal |
ISSN: | 0360-3199 (print) |
DOI: | 10.1016/j.ijhydene.2011.12.095 |
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