English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/120880
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

O K-edge X-ray absorption spectroscopy in Al-doped ZnO materials: Structural vs electronic effects

AutorGuglieri, C.; Chaboy, Jesús
Fecha de publicación2014
EditorAmerican Chemical Society
CitaciónJournal of Physical Chemistry C 118(44): 25779-25785 (2014)
ResumenThis work reports an O K-edge X-ray absorption spectroscopy (XAS) study of Al-doped ZnO nanoparticles and films showing room-temperature ferromagnetism (RTFM). The origin of this ferromagnetism remains controversial as different conclusions are derived for analogous systems. Among those, charge-transfer effects and the presence of vacancies are often suggested, based on the modification of similar XAS spectra with respect to that of undoped ZnO. We present here a critical re-examination of the reported O K-edge absorption in these materials, by comparing the experimental spectra to ab initio theoretical calculations, paying special attention to the role of structural modifications, instead of the currently accepted electronic interpretation, into driving the observed spectral modifications. Our results indicate that the reported variations of the XAS spectral profile are not due to the charge-transfer effects involving Al and O, but are associated with the structural modification of the oxygen next-neighboring arrangement. Indeed, the structural changes are in agreement with the formation of interfaces between ZnO and alumina-based regions, upon the reaction between ZnO and Al. According to previous studies, the RTFM likely resides in these interfaces associated with the oxygen ions.
URIhttp://hdl.handle.net/10261/120880
DOI10.1021/jp508461d
Identificadoresdoi: 10.1021/jp508461d
issn: 1932-7447
e-issn: 1932-7455
Aparece en las colecciones: (ICMA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.