Author/Authors :
V. B. Vykhodets، نويسنده , , Vladimir B. and Jarvis، نويسنده , , Emily A.A. and Kurennykh، نويسنده , , Tatiana E. and Beketov، نويسنده , , Igor V. and Obukhov، نويسنده , , Sviatoslav I. and Samatov، نويسنده , , Oleg M. and Medvedev، نويسنده , , Anatoly I. and Davletshin، نويسنده , , Andrey E.، نويسنده ,
Abstract :
Aluminaʹs importance has motivated detailed exploration of α-Al2O3(0001). Under certain conditions, this surface undergoes a (√31 × √31)R9° reconstruction resulting in a layer of aluminum, Al(111), over a stoichiometric substrate. γ-Al2O3 is less understood but dominates material applications. We show that γ-Al2O3 nanopowders present aluminum-enriched surfaces similar to those of the reconstructed α-Al2O3(0001). Employing nuclear reaction analysis supported by density functional calculations, we quantitatively identify the elemental composition of γ-Al2O3 and find a transition to pure aluminum termination.
Keywords :
Density functional calculations , Gamma alumina , nanopowders , Surface stoichiometry , Nuclear reaction analysis
