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Optical Engineering

Strain in microcrystals and in superlattices
Author(s): Luigi Giacomo Conti
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Paper Abstract

A new general theory of the dependence of strain on crystal size L for defect-free cubic materials bounded by {100} faces is presented. While current theories predict a (γ/L) dependence, this work suggests a (F/L)1/2 dependence by considering both surface tension (γ) and surface free energy (6FL2) effects. Since small crystals, especially if very fresh or not annealed, may contain a large fraction of point defects, the size dependent strain must be separated from the defect-induced strain. The theory is verified by reinterpreting three experimental studies reported in the literature and based on the techniques of electron microscopy, x-ray diffraction, and nuclear magnetic resonance. The theory offers a straightforward explanation for the extra longitudinal strain in superlattices, as detected by Raman spectroscopy.

Paper Details

Date Published: 1 April 1990
PDF: 8 pages
Opt. Eng. 29(4) doi: 10.1117/12.55596
Published in: Optical Engineering Volume 29, Issue 4
Show Author Affiliations
Luigi Giacomo Conti, Univ. of Rome La Sapienza (Italy)

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