Local estimation of lattice constants in HRTEM images.
Ultramicroscopy
; 111(8): 1083-92, 2011 Jul.
Article
en En
| MEDLINE
| ID: mdl-21740872
A model-based approach to estimate lattice constants from an atomically resolved HRTEM image is presented. The approach only utilizes the inherent periodicity of these images and does not require a centrosymmetric structure of the specimen. This allows the evaluation of, for instance, wurtzite-based materials like InGaN/GaN heterostructures. The lattice constants are determined within precisions below 3 pm from areas only a few unit cells large. This makes this method suitable for further strain/compositional analysis. Furthermore, the impact of the approximations of the true detector's covariance matrices on the assessment of the model-based approach is investigated, and insights into the quality of these noise models of the detector are gained.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Ultramicroscopy
Año:
2011
Tipo del documento:
Article
País de afiliación:
Alemania