Dislocation kink motion - ab-initio calculations and atomic resolution movies

John Spence, H. R. Kolar, Y. Huang, H. Alexander

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

The results of recent ab-initio, relaxed, computations for the energy barrier to the motion of a kink on a 30° partial dislocation in silicon are summarised. The electronic structure and charge density are given. We suggest that the shearing motions involved with ductility and kink motion are controlled by the band structure energy involving valence electrons, whereas the tensile forces involved in fracture depend on both ion-ion and valence forces. Experimental atomic resolution TEM images of dissociated dislocation lines in silicon are discussed. These are formed using 'forbidden reflections' with the dislocation lines lying on (111), normal to the electron beam. For images of samples at 600 C recorded at video rates, differences between successive frames reveal the motion of individual kinks, from which the kink velocity and migration energy can be estimated.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsEfthimios Kaxiras, John Joannopoulos, Priya Vashishta, Rajiv K. Kalia
PublisherMaterials Research Society
Pages261-270
Number of pages10
Volume408
StatePublished - 1996
EventProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
Duration: Nov 27 1995Dec 1 1995

Other

OtherProceedings of the 1996 MRS Fall Symposium
CityBoston, MA, USA
Period11/27/9512/1/95

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Spence, J., Kolar, H. R., Huang, Y., & Alexander, H. (1996). Dislocation kink motion - ab-initio calculations and atomic resolution movies. In E. Kaxiras, J. Joannopoulos, P. Vashishta, & R. K. Kalia (Eds.), Materials Research Society Symposium - Proceedings (Vol. 408, pp. 261-270). Materials Research Society.