Noncontact atomic force microscopy study of the spinel MgAl(2)O(4)(111) surface.
Beilstein J Nanotechnol
; 3: 192-7, 2012.
Article
em En
| MEDLINE
| ID: mdl-22496991
ABSTRACT
Based on high-resolution noncontact atomic force microscopy (NC-AFM) experiments we reveal a detailed structural model of the polar (111) surface of the insulating ternary metal oxide, MgAl(2)O(4) (spinel). NC-AFM images reveal a 6â3×6â3R30° superstructure on the surface consisting of patches with the original oxygen-terminated MgAl(2)O(4)(111) surface interrupted by oxygen-deficient areas. These observations are in accordance with previous theoretical studies, which predict that the polarity of the surface can be compensated by removal of a certain fraction of oxygen atoms. However, instead of isolated O vacancies, it is observed that O is removed in a distinct pattern of line vacancies reflected by the underlying lattice structure. Consequently, by the creation of triangular patches in a 6â3×6â3R30° superstructure, the polar-stabilization requirements are met.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Beilstein J Nanotechnol
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Dinamarca