Photoelectron spectroscopic investigations of the surface reactivity of crystalline and amorphous TiCu alloys Academic Article uri icon

abstract

  • The surface reactivity of in-situ co-condensed crystalline and amorphousTiCu2 alloys has been compared in the present study; the extent of reactivity of the samples was examined by X-ray photo-electron spectroscopy (XPS) after annealing at high vacuum and reacting the surface with 0.67 Pa (5 10-3Torr) of oxygen at pre-selected temperatures. The amorphous TiCu alloy exhibited higher initial surface reactivity by forming oxidized titanium more readily. At intermediate temperatures (300-400 C), continued oxidation of both alloys led to the formation of titanium oxide overlayers such that there was a minimal amount of surface copper. Annealing in high vacuum to 600 C led to the decomposition of Ti2O3 and TiO2 on both alloys; however, the small amount of copper detectable by XPS remained metallic. At higher oxygen pressures, the complete oxidation of surface titanium to TiO2 occurred at 400 C for the amorphous alloy, and at 500 C for the crystalline state. It was after this point that the underlying metallic copper underwent oxidation to Cu1+ and diffused to the surface region through the titanium oxide overlayer. These findings are discussed in terms of observed differences between the surface oxidation behavior of crystalline and amorphous Ti alloys. 1991.

published proceedings

  • Materials Science and Engineering: A

author list (cited authors)

  • Mebrahtu, T., Hess, T. R., Mencer, D. E., Balke, K. G., Naugle, D. G., & Cocke, D. L.

complete list of authors

  • Mebrahtu, T||Hess, TR||Mencer, DE||Balke, KG||Naugle, DG||Cocke, DL

publication date

  • January 1, 1991 11:11 AM