Atomic dislocation core parameters

Autor(en)

Gunther Schöck

Abstrakt

The classical expression for the elastic self-stress and the elastic self-energy of dislocation loops in a linear elastic continuum by line integrals show singularities and require a cut-off distance along the dislocation line. Somewhat different singularities exist in the core region of straight dislocation lines and require a cut-off radius r0 perpendicular to the dislocation line. These singularities can be avoided when the singular Volterra dislocation line is replaced by a distribution of infinitesimal dislocations. The width of this distribution and the core energy EA cannot be derived from continuum theory but depends on the atomic arrangement in the crystal lattice. It is shown that by using the Peierls model and the concept of Peierls dislocations the values of r0 and EA can be calculated for the different materials and physically realistic values for the cut-off parameters can be obtained.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Universität Wien

Journal

Physica Status Solidi. B: Basic Research

Band

247

Seiten

265-268

Anzahl der Seiten

4

ISSN

0370-1972

DOI

https://doi.org/10.1002/pssb.200945379

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8980a5dc-6a4d-4622-a1f7-aec485471027