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Título

“In situ” XPS studies of laser-induced surface nitridation and oxidation of tantalum

AutorLahoz, Ruth; Espinós, J.P. ; Yubero, Francisco ; Rodríguez González-Elipe, Agustín; Fuente, Germán F. de la
Fecha de publicación2015
EditorCambridge University Press
Materials Research Society
CitaciónJournal of Materials Research 30(19): 2967-2976 (2015)
ResumenThis work studies the nitridation of Ta by laser irradiation by means of x-ray photoelectron spectroscopy. The study has been carried out under in situ conditions by controlling the nitrogen partial pressure, the presence of traces of oxygen, and the irradiance of the laser. It is found that a thin layer of Ta2O5 is directly obtained when irradiating in the presence of oxygen, while a Ta3N5 surface compound and some minor contributions of nonstoichiometric phases are formed in the presence of nitrogen. For O2:N2 mixtures at 0.1 Pa, preferential nitride formation occurs up to a ratio of 1:4, while Ta2O5 starts to be predominant for ratios above this value. The air stability of the tantalum nitride layer formed by laser irradiation and the surface topography of the irradiated metal are also studied. The possible factors determining this behavior are discussed.
URIhttp://hdl.handle.net/10261/147732
DOI10.1557/jmr.2015.190
Identificadoresdoi: 10.1557/jmr.2015.190
e-issn: 2044-5326
issn: 0884-2914
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