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Coherency Strain of an Overgrown Island

Published online by Cambridge University Press:  25 February 2011

J. K. Lee  and
S. A. Hackney
J. K. Lee
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931
S. A. Hackney
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931
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Abstract

The lattice misfit strain in an overgrown island is considered to be accommodated by twodistinctive domains; a pure coherency domain (ε domain) and a domain of misfit dislocations (δ domain). By introducing such two different constituents, the model predicts the transition condition from a “single phase” state (ε phase) to a “two-phase mixture” (ε+δ) as a function of misfit strain. Further, as in the chemical thermodynamics of a binary alloy system, energy vs. misfit strain diagrams allow us to understand possible existence of various metastable states which may be associated with an overgrowth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 148: Symposium D – Chemistry and Defects in Semiconductor Heterostructures , 1989 , 315
Copyright
Copyright © Materials Research Society 1989

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