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Dislocations and plasticity of experimentally deformed coesite

Hosni Idrissi, Patrick Cordier, Damien Jacob and Nicolas Walte
Dislocations and plasticity of experimentally deformed coesite
European Journal of Mineralogy (August 2008) 20 (4): 665-671


Dislocation microstructures have been characterized by transmission electron microscopy in polycrystalline coesite deformed experimentally at 4 GPa, 1200 degrees C. Burgers vectors have been determined by large-angle convergent-beam electron diffraction. Sample orientation was assisted by precession electron diffraction to overcome difficulties arising from pseudo-hexagonal symmetry. The results are explained by using a pseudo-hexagonal setting. We found that most dislocations observed are of the 1/3{2110} type. No clear glide plane was identified, suggesting that climb is activated under these conditions. This conclusion is supported by the observation of numerous subgrain boundaries. We have also observed some [0001] dislocations. Finally, the C12/c1 space group to which coesite belongs being centred, an additional slip system is observed: 1/6[1213](0111)(1/2[10](110) in the monoclinic setting).

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 20
Serial Issue: 4
Title: Dislocations and plasticity of experimentally deformed coesite
Affiliation: CNRS, Laboratoire de Structure et Proprietes de l'Etat Solide, Villeneuve d'Ascq, France
Pages: 665-671
Published: 200808
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 25
Accession Number: 2008-114913
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Universitaet Bayreuth, DEU, Federal Republic of Germany
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: 200843
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