${\mathrm{Cu}}_{2}\mathrm{O}$ Island Shape Transition during Cu-Au Alloy Oxidation

${Cu}_{2} O$ Island Shape Transition during Cu-Au Alloy Oxidation

G.-W. Zhou, L. Wang, R. C. Birtcher, P. M. Baldo, J. E. Pearson, J. C. Yang, and J. A. Eastman

Phys. Rev. Lett. 96, 226108 – Published 9 June 2006

Abstract

In situ transmission electron microscopy observations of the oxidation of (001) Cu-Au alloys indicate that the ${Cu}_{2} O$ 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.

Received 9 February 2006

DOI:https://doi.org/10.1103/PhysRevLett.96.226108

Authors & Affiliations

G.-W. Zhou¹, L. Wang², R. C. Birtcher¹, P. M. Baldo¹, J. E. Pearson¹, J. C. Yang², and J. A. Eastman^1,*

¹Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
²Materials Science and Engineering Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA

^*To whom correspondence should be addressed. Email address: jeastman@anl.gov

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Vol. 96, Iss. 22 — 9 June 2006

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Physical Review Letters

Cu2O Island Shape Transition during Cu-Au Alloy Oxidation

G.-W. Zhou, L. Wang, R. C. Birtcher, P. M. Baldo, J. E. Pearson, J. C. Yang, and J. A. Eastman

Phys. Rev. Lett. 96, 226108 – Published 9 June 2006

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${Cu}_{2} O$ Island Shape Transition during Cu-Au Alloy Oxidation