Titre : |
Etude de la Stabilité Structurale des Intermétalliques Polaire de type phases de Laves YM2 (M : Ni, Cu, Zn) |
Type de document : |
texte imprimé |
Auteurs : |
MOSTAFA KERIM BENABADJI, Auteur |
Année de publication : |
2013 |
Importance : |
56p. |
Présentation : |
ill. |
Format : |
30cm. |
Langues : |
Français (fre) |
Mots-clés : |
Intermétalliques Polaire de type phases de Laves YM2 (M : Ni, Cu, Zn) |
Résumé : |
The computed heat of formation concludes that YZn2 and YCu2
phase has the strongest alloying ability as well as the highest structural
stability. Transition phase from the CeCu2 structure to Laves
phase structures is concluded at high-pressure for both compounds.
As main results from our calculations, we confirm that
the bonding between open packed, polyanionic, CeCu2-type phases
and close packed Laves phases is primarily governed by the electronegativity
difference between the Y–Zn and Y–Cu. As other results,
we report that decreasing the electronegativity difference
between components in binary systems induced by application of
high pressure. As consequence the CeCu2-type polar intermetallics
can be compressed into Laves phases.
In addition, a metallic Y–Y bonding and Cu–Cu and Zn–Zn covalent
bonding are expected from computed charge density distribution.
Moreover, the difference in electronegativity between Y and
Cu or Y and Zn induces a polar covalent bonding between such
atoms. |
Etude de la Stabilité Structurale des Intermétalliques Polaire de type phases de Laves YM2 (M : Ni, Cu, Zn) [texte imprimé] / MOSTAFA KERIM BENABADJI, Auteur . - 2013 . - 56p. : ill. ; 30cm. Langues : Français ( fre)
Mots-clés : |
Intermétalliques Polaire de type phases de Laves YM2 (M : Ni, Cu, Zn) |
Résumé : |
The computed heat of formation concludes that YZn2 and YCu2
phase has the strongest alloying ability as well as the highest structural
stability. Transition phase from the CeCu2 structure to Laves
phase structures is concluded at high-pressure for both compounds.
As main results from our calculations, we confirm that
the bonding between open packed, polyanionic, CeCu2-type phases
and close packed Laves phases is primarily governed by the electronegativity
difference between the Y–Zn and Y–Cu. As other results,
we report that decreasing the electronegativity difference
between components in binary systems induced by application of
high pressure. As consequence the CeCu2-type polar intermetallics
can be compressed into Laves phases.
In addition, a metallic Y–Y bonding and Cu–Cu and Zn–Zn covalent
bonding are expected from computed charge density distribution.
Moreover, the difference in electronegativity between Y and
Cu or Y and Zn induces a polar covalent bonding between such
atoms. |
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