title: Cu2O island shape transition during Cu-Au alloy oxidation.
abstract: In situ transmission electron microscopy observations of the oxidation of (001) Cu-Au alloys indicate that the Cu2O islands that form undergo a remarkable transformation from an initially compact morphology to a dendritic structure as growth proceeds. Correspondingly, the surface composition becomes nonuniform and the fractal dimension associated with the islands evolves from 2.0 to a stable value of 1.87, indicating a transition in the rate-limiting mechanism of oxidation from oxygen surface diffusion to diffusion of copper through the increasingly gold-rich regions adjacent to the islands.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: G-W
authors.initials: GW
authors.lastname: Zhou
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: R C
authors.initials: RC
authors.lastname: Birtcher
authors.forename: P M
authors.initials: PM
authors.lastname: Baldo
authors.forename: J E
authors.initials: JE
authors.lastname: Pearson
authors.forename: J C
authors.initials: JC
authors.lastname: Yang
authors.forename: J A
authors.initials: JA
authors.lastname: Eastman