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Criteria for Misfit Localization at Interfaces

Published online by Cambridge University Press:  15 February 2011

Witold Lojkowski
Witold Lojkowski*
Affiliation:
High Pressure Research Center, Polish Academy of Sciences, Sokolowska 29, 01-142 Warsaw, Poland
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Abstract

It is well known that in many cases, the structure of interfaces is well described in terms of “good matching” islands, separated by misfit dislocations. The “0” lattice theory can predict the dislocations' spacing but not their core width. In the present paper, a new physical parameter: p, called further “localization parameter”, is introduced. It permits the assessment of the width of misfit dislocations. p is expressed as p=E AB /E where E AB is the bonding energy of the two crystals and E is their average cohesion energy. The localization parameter was calculated for about 30 interfaces: metal/metal, metal/ceramics, ceramics/ceramics. For p<0.25, misfit dislocations are delocalized.

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