Maria Ronay
JES
In situ x-ray photoelectron spectroscopy was used to study the oxidation of niobium films covered by some monolayers of cerium. Significant amounts of Nb2O5 are formed at pressures as low as 6.6 × 10-6 Pa, promoted by the cerium overlayer. This catalytic activity is related to the trivalent-to- tetravalent valence change of the cerium during oxidation. The kinetics of Nb2O5 formation beneath the oxidized cerium shows two stages; the first is fast growth limited by ion diffusion, the second is slow growth by electron tunneling. © 1984 The American Physical Society.
Maria Ronay
JES
A. Moser, A. Oosenbrug, et al.
Applied Physics Letters
Maria Ronay, C.F. Aliotta, et al.
Journal of Applied Physics
A. Paccagnella, A.C. Callegari, et al.
Journal of Applied Physics