Jf. Silvain et al., X-RAY PHOTOELECTRON-SPECTROSCOPY AND TRANSMISSION ELECTRON-MICROSCOPYSTUDIES OF THE NIAL AL2O3 INTERFACIAL CHEMICAL COMPATIBILITY/, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 13(4), 1995, pp. 1893-1900
Citations number
19
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
beta-NiAl thin films were prepared by physical vapor deposition (PVD)
either on thin PVD Al2O3 films on Si substrates or on sapphire single
crystals. These samples were characterized by x-ray diffraction and el
ectron spectroscopies [Auger electron spectroscopy and x-ray photoelec
tron spectroscopy (XPS)]. Crystalline films were obtained after deposi
tion Bt room temperature. XPS depth profiles and transmission electron
microscopy cross sections show that the NiAl-Al2O3 interface is sharp
(1 nm) and that NiAl oxidation occurs. Ni remains chemically unaffect
ed by the presence of oxygen while the formation of Al3+ compounds is
discussed. Within the film Al and Ni appear in a single chemical envir
onment characterized by binding energies close to those of pure interm
etallic compounds. Annealing of these wafers at 600 degrees C induces
surface oxidation and,particularly, the formation of an Al2O3 protecti
ve layer. (C) 1995 American Vacuum Society.