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• W2092849844 abstract "Theoretical calculations of the structure, formation, and migration of kinks on a nondissociated screw dislocation in silicon have been carried out using density functional theory calculations as well as calculations based on interatomic potential functions. The results show that the structure of a single kink is characterized by a narrow core and highly stretched bonds between some of the atoms. The formation energy of a single kink ranges from $0.9phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}1.36phantom{rule{0.3em}{0ex}}mathrm{eV}$, and is of the same order as that for kinks on partial dislocations. However, the kinks migrate almost freely along the line of an undissociated dislocation unlike what is found for partial dislocations. The effect of stress has also been investigated in order to compare with previous silicon deformation experiments which have been carried out at low temperature and high stress. The energy barrier associated with the formation of a stable kink pair becomes as low as $0.65phantom{rule{0.3em}{0ex}}mathrm{eV}$ for an applied stress on the order of $1phantom{rule{0.3em}{0ex}}mathrm{GPa}$, indicating that displacements of screw dislocations likely occur via thermally activated formation of kink pairs at room temperature." @default.
• W2092849844 created "2016-06-24" @default.
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• W2092849844 date "2008-02-14" @default.
• W2092849844 modified "2023-10-01" @default.
• W2092849844 title "Theoretical study of kinks on screw dislocation in silicon" @default.
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• W2092849844 doi "https://doi.org/10.1103/physrevb.77.064106" @default.
• W2092849844 hasPublicationYear "2008" @default.
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