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abinit432

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Structure ¨¦lectronique du nitrure de bore cubique dans l'approximation de la densit¨¦ ¨¦lectronique locale

Abstract
The electronic structure of cubic boron nitride is revisited using ASW self-consistent calculations. Our results are confronted with calculated data from the literature. The equilibrium lattice constant, the bulk modulus, the valence band width and to a lesser extent the band gaps are found to be within reasonable agreement with experiment. Empty spheres (pseudo-atoms with Z = 0) introduced at the interstitial sites create states at the bottom of the conduction band. They should play a role in modifying the band structure when interstitial atoms are introduced.

R¨¦sum¨¦
La structure ¨¦lectronique du nitrure de bore cubique est r¨¦examin¨¦e par calculs autocoh¨¦rents utilisant la m¨¦thode ASW. Nos r¨¦sultats sont compar¨¦s avec ceux calcul¨¦s de la litt¨¦rature. Les valeurs du param¨¨tre de maille, de l'inverse de la compressibilit¨¦, de la largeur de la bande de valence et ¨¤ une moindre ¨¦chelle des gaps direct et indirect, sont en accord relatif avec les valeurs exp¨¦rimentales. Des sph¨¨res vides (pseudo-atomes avec Z = 0) introduites dans les sites interstitiels cr¨¦ent des ¨¦tats au bas de la bande de conduction. Elles devraient jouer un rôle en modifiant la structure de bandes lorsque des atomes interstitiels sont introduits.


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