Dislocations and plasticity of experimentally deformed coesite
(2008) European Journal of Mineralogy — Vol. 20, p. 665-671 (2008)
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- Authors
- Abstract
- Dislocation microstructures have been characterized by transmission electron microscopy in polycrystalline coesite deformed experimentally at 4 GPa, 1200°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 pseudohexagonal 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[110](110) in the monoclinic setting).
- Affiliations
Université des Sciences et Technologies de Lille Laboratoire de Structure et Propriétés de l'Etat solide Universität Bayreuth Bayerisches Geoinstitut
Citations
Idrissi, H., Cordier, P., Jacob, D., & Walte, N. (2008). Dislocations and plasticity of experimentally deformed coesite. European Journal of Mineralogy, 20, 665-671. https://doi.org/10.1127/0935-1221/2008/0020-1849 (Original work published 2008)