Crystal growth and defects
Crystal growth and defects
Crystal growth and defects
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Misfit dislocations <strong>and</strong> <strong>growth</strong><br />
Misfit between regions of different compositions (impurities, dopants)<br />
resulting in a change in the lattice constant<br />
Misfit at boundaries of <strong>growth</strong> pyramids or facets during non-planar<br />
<strong>growth</strong><br />
Simple case of constant concentration gradient gives two<br />
perpendicular sets of edge dislocations with a density<br />
£<br />
¤<br />
¥ b grad c<br />
( ¢ linear expansion coefficient related to the concentration c,<br />
b magnitude of the Burgers vector)<br />
hsl 2002 – Structure of imperfect crystals 2 – <strong>Crystal</strong> <strong>growth</strong> <strong>and</strong> defect formation 3
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