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Scanning tunneling microscope observations of the mirror region of silicate glass fracture surfaces

Published online by Cambridge University Press:  03 March 2011

D.M. Kulawansa
Affiliation:
Physics Department, Washington State University, Pullman, Washington 99164-2814
L.C. Jensen
Affiliation:
Physics Department, Washington State University, Pullman, Washington 99164-2814
S.C. Langford
Affiliation:
Physics Department, Washington State University, Pullman, Washington 99164-2814
J.T. Dickinson
Affiliation:
Physics Department, Washington State University, Pullman, Washington 99164-2814
Yoshihisa Watanabe
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Hashirimizu, Yokosuka, Kanagawa 239, Japan
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Abstract

We report scanning tunneling microscope images of gold-coated fracture surfaces of soda lime glass and fused silica in the mirror region. The scans show a variety of nanometer scale features that are attributed to fracture phenomena at this scale. We find considerable similarity to the structures observed in regions of extensive crack branching (e.g., “mist”). The density of these features increases as one progresses away from the crack origin toward the mirror-mist boundary. Comparisons are made between soda lime glass and fused silica, revealing differences in the local deformation behavior of these two materials. Self-similarity of the observed structures is probed by measurements of the fractal dimension, Df, of the surfaces created in soda lime glass near the mirror-mist boundary, where we observe 2.17 > Df > 2.40.

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Articles
Copyright
Copyright © Materials Research Society 1994

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