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Title: Morphological development of oxygen bubbles in anodic alumina

Abstract

The morphological development of oxygen bubbles in amorphous, anodic alumina is examined during anodizing an Al-1 atom % Cu alloy. Using transmission electron microscopy, a sequence of stripped films reveals the dynamic evolution of numerous bubbles in the thickening film. The formation of the bubbles is associated with the enrichment of copper in the alloy due to growth of the anodic oxide. Evidently the alumina exhibits a liquid-like behavior under the electric field, assisted by inherent free-volume, which accommodates nucleation, growth, clustering, and coalescence of bubbles, without damage to the film. Bubbles nucleate throughout growth of the film, close to the alloy/film interface, but growth of pre-existing bubbles appears favored. The bubbles, which number about 1 x 10{sup 14} m{sup {minus}2}, are in pressure equilibrium, with typical pressures of several hundred megapascals. The bubbles, with dimensions up to a few tens of nanometers, are obstacles to ionic transport, which leads to nonuniformity of film thickness and interfacial roughness.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Manchester Inst. of Science and Technology (GB)
OSTI Identifier:
20080573
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; BUBBLES; MORPHOLOGY; ALUMINIUM BASE ALLOYS; COPPER ADDITIONS; ANODIZATION

Citation Formats

Zhou, X., Thompson, G.E., Habazaki, H., Paez, M.A., Shimizu, K., Skeldon, P., and Wood, G.C. Morphological development of oxygen bubbles in anodic alumina. United States: N. p., 2000. Web. doi:10.1149/1.1393428.
Zhou, X., Thompson, G.E., Habazaki, H., Paez, M.A., Shimizu, K., Skeldon, P., & Wood, G.C. Morphological development of oxygen bubbles in anodic alumina. United States. doi:10.1149/1.1393428.
Zhou, X., Thompson, G.E., Habazaki, H., Paez, M.A., Shimizu, K., Skeldon, P., and Wood, G.C. Mon . "Morphological development of oxygen bubbles in anodic alumina". United States. doi:10.1149/1.1393428.
@article{osti_20080573,
title = {Morphological development of oxygen bubbles in anodic alumina},
author = {Zhou, X. and Thompson, G.E. and Habazaki, H. and Paez, M.A. and Shimizu, K. and Skeldon, P. and Wood, G.C.},
abstractNote = {The morphological development of oxygen bubbles in amorphous, anodic alumina is examined during anodizing an Al-1 atom % Cu alloy. Using transmission electron microscopy, a sequence of stripped films reveals the dynamic evolution of numerous bubbles in the thickening film. The formation of the bubbles is associated with the enrichment of copper in the alloy due to growth of the anodic oxide. Evidently the alumina exhibits a liquid-like behavior under the electric field, assisted by inherent free-volume, which accommodates nucleation, growth, clustering, and coalescence of bubbles, without damage to the film. Bubbles nucleate throughout growth of the film, close to the alloy/film interface, but growth of pre-existing bubbles appears favored. The bubbles, which number about 1 x 10{sup 14} m{sup {minus}2}, are in pressure equilibrium, with typical pressures of several hundred megapascals. The bubbles, with dimensions up to a few tens of nanometers, are obstacles to ionic transport, which leads to nonuniformity of film thickness and interfacial roughness.},
doi = {10.1149/1.1393428},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}