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• W2064157251 abstract "First-principles calculations on the crystal and electronic structures of LaNi4AlHx (x = 1, 2, 3, 4, 4.5, 5 and 7) solid solution and hydrides have been performed by employing the plane-wave pseudo-potential method. Their equilibrium structures have been determined based on the calculated relative stabilities of hydrogen occupation sites in LaNi4Al and the rule of H–H separation to be no less than 0.21 nm, as well as the full geometry optimization. The covalency and ionicity analysis shows that the interaction between H and Ni is covalent and ionic; between H and La mainly ionic; between H and Al for x = 1, 2, 3 and 4 mainly ionic and for x = 4.5, 5 and 7 both covalent and ionic. The change of BOH-Nis(orIonicityH–Las) with x can be a phenomenological indication of the experimental phase transformation for hydrogen solubility in LaNi4Al. The comparison of the calculated stability of hydrogen at interstices in LaNi4Al and LaNi5 shows that the possible hydrogen occupation sites in LaNi4Al are fewer than those in LaNi5. This contributes to the decrease of hydrogen storage capacity for LaNi4Al, which is illustrated by comparing the electron density distribution of LaNi4AlH7 with LaNi5H7. Except for H–H repulsions, the change of absorption energy with hydrogen content, arising from the fact that an H atom tends to keep away from an Al atom, elucidates the limited maximum hydrogen content in LaNi4Al." @default.
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• W2064157251 date "2006-01-01" @default.
• W2064157251 modified "2023-09-27" @default.
• W2064157251 title "First-principles calculations of LaNi4Al–H solid solution and hydrides" @default.
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• W2064157251 doi "https://doi.org/10.1016/j.actamat.2005.09.027" @default.
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