Study of partial dislocations in wurtzite GaN using gradient elasticity

Joseph Kioseoglou 1George P. Dimitrakopulos 1Philomela Komninou 1Iason Konstantopoulos 2Elias C. Aifantis 2,3Theodoros Karakostas 1

1. Dept. of Physics, Aristotle University of Thessaloniki, 54 124 Thessaloniki, Greece, Thessaloniki 54 124, Greece
2. General Department of Physics and Mathematics, Polytechnic School, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece, Thessaloniki GR-54124, Greece
3. Michigan Technological University, Houghton, MI 49931, United States

Abstract

The gradient elasticity analytical solution for the dislocation energy can eliminate the core region singularities of elasticity theory. Such an approach is employed here in connection to previous empirical potential calculations of 1/6 <20-23> partial dislocations delineating the I1 intrinsic basal stacking fault in wurtzite GaN. Twelve stable configurations obtained for each of the two GaN polarities, their core radii, and their energies are considered. The gradient coefficients and the dislocations’ parameters are evaluated and compared with those obtained with elasticity calculations. The gradient solution is found to interpret accurately the dislocation energies calculated by the empirical potential within the core region.

 

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium F, by Theodoros Karakostas
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-24 13:39
Revised:   2009-06-07 00:44