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Kinetics of surface area changes in glasslike carbon: reanalysis of the data

Published online by Cambridge University Press:  31 January 2011

Jalil Lachter  and
Robert H. Bragg
Jalil Lachter
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Hearst Mining Building, University of California, Berkeley, California 94720
Robert H. Bragg
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Hearst Mining Building, University of California, Berkeley, California 94720
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Abstract

Previous small-angle scattering measurements of the kinetics of changes of the surface area of pores in an annealed glasslike carbon have been reanalyzed in terms of the Lifschitz, Slyozov, and Wagner coarsening theory in which the surface area is used to obtain an average spherical pore size. When the data are corrected for the transient heat-up time to reach the annealing temperature, the reanalysis leads to an activation energy of 75 ± 7.2. kcal/mol, in agreement with recent results (75 ± 3.6 kcal/mol) obtained using direct measurements of changes in pore size as determined by the pore radius of gyration. The best value for the activation energy for vacancy migration in carbon is therefore estimated at 75 ± 3.2 kcal/mol.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 846 - 849
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

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