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Straight and kinked 90° partial dislocations in diamond and 3C-SiC

A T Blumenau1,2,6, C J Fall2, R Jones2, M I Heggie3, P R Briddon4, T Frauenheim1 and S Öberg5

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Density-functional based calculations are used to investigate low energy core structures of 90° partial dislocations in diamond and 3C-SiC. In both materials dislocation glide is analysed in terms of kink formation and migration and the fundamental steps to kink migration are investigated. We find the C terminated core structure in SiC to be more mobile than the Si core. However, the Si partial is electrically active and this opens the possibility of recombination-enhanced glide under ionizing conditions or an enhanced mobility in doped material.


PACS

61.72.Hh Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)

61.72.Bb Theories and models of crystal defects

Subjects

Condensed matter: structural, mechanical & thermal

Dates

Issue 48 (9 December 2002)

Received 27 September 2002

Published 22 November 2002



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