INVESTIGADORES
PASSEGGI mario Cesar Guillermo
congresos y reuniones científicas
Título:
Chemical reactions at surfaces: titanium oxidation
Autor/es:
VAQUILA, I.; VERGARA, L.I.; PASSEGGI (JR.), M.C.G.; VIDAL, R.A.; FERRÓN, J.
Lugar:
Rosario (Santa Fe), Argentina, 14-18 Septiembre
Reunión:
Jornada; Jornadas SAM1998, IBEROMET V; 1998
Institución organizadora:
Sociedad Argentina de Metales
Resumen:
Auger electron spectroscopy has been used to study the first stages of titanium oxidation. Titanium at room and high temperature, as well as thin films deposited over a metal substrate, were oxidized at low pressure. The authors found, using factor analysis, two different regimes depending on the sample temperature. For temperatures below 200°C the oxidation is characterized by the presence of only one oxide phase: TiO2. At higher temperatures, the presence of Ti2O3 is detected from the beginning of the process. For thin films [less than one monolayer (ML)] only TiO2 was found, but for thicker films a new oxide phase is detected (TiOx, x<2). Finally, for thicknesses >7 ML, only TiO2 is detected.