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Application of the Peierls-Nabarro model to dislocations in forsterite

Julien Durinck, Philippe Carrez and Patrick Cordier
Application of the Peierls-Nabarro model to dislocations in forsterite (in EMPG XI; Experimental mineralogy, petrology and geochemistry symposium, Jonathan D. Bundy (editor), Simon C. Kohn (editor) and Michael J. Walter (editor))
European Journal of Mineralogy (October 2007) 19 (5): 631-639

Abstract

We present a numerical model of dislocation cores in Mg (sub 2) SiO (sub 4) forsterite based on the Peierls-Nabarro model and using generalised stacking faults as an input. The generalised stacking faults have been calculated from ab initio density-functional theory using VASP. Core profiles, atomic models and Peierls stresses are proposed for dislocations from the following slip systems: [100](010), [100](001), [100]{021}, [001](010), [001](100) and [001]{110}. Calculations have been performed at 0 and 10 GPa, to investigate the influence of pressure. We show that [100] dislocations have narrow cores when [001] dislocations tend to spread into (100) and {110} planes. A strong softening effect is found with pressure on the [001](010) slip system. Our study emphasizes the influence of lattice friction on plastic deformation of forsterite with, beyond Peierls stresses, possible effects related to non-planar core structures.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 19
Serial Issue: 5
Title: Application of the Peierls-Nabarro model to dislocations in forsterite
Title: EMPG XI; Experimental mineralogy, petrology and geochemistry symposium
Author(s): Durinck, JulienCarrez, PhilippeCordier, Patrick
Author(s): Bundy, Jonathan D.editor
Author(s): Kohn, Simon C.editor
Author(s): Walter, Michael J.editor
Affiliation: Universite des Sciences et Technologies de Lille, Laboratoire de Structure et Proprietes de l'Etat Solide, Villeneuve d'Ascq, France
Pages: 631-639
Published: 200710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Eleventh international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Bristol, GBR, United Kingdom
Meeting date: 20060911Sept. 11-13, 2006
References: 52
Accession Number: 2008-002131
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200802
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