Extreme deviations from stoichiometry in alumina nanopowders

Autor:	Emily A. A. Jarvis, Andrey E. Davletshin, Tatiana Eugenievna Kurennykh, V. B. Vykhodets, S. I. Obukhov, O. M. Samatov, Anatoly I. Medvedev, I. V. Beketov
Rok vydání:	2014
Předmět:	Elemental composition Materials science Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Substrate (electronics) Condensed Matter Physics Surfaces Coatings and Films chemistry Aluminium Nuclear reaction analysis Materials Chemistry Layer (electronics) Stoichiometry
Zdroj:	Surface Science. 630:182-186
ISSN:	0039-6028
Popis:	Alumina's importance has motivated detailed exploration of α-Al 2 O 3 (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-Al 2 O 3 is less understood but dominates material applications. We show that γ-Al 2 O 3 nanopowders present aluminum-enriched surfaces similar to those of the reconstructed α-Al 2 O 3 (0001). Employing nuclear reaction analysis supported by density functional calculations, we quantitatively identify the elemental composition of γ-Al 2 O 3 and find a transition to pure aluminum termination.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50fd8c0ab3cb5384aa79333945f18043 https://doi.org/10.1016/j.susc.2014.08.009 Zobrazit plný text záznamu Full Text from ScienceDirect