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Title
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Dislocations and plasticity of experimentally deformed coesite
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Author
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Abstract
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| 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 < 2 (1) over bar(1) over bar0 > 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 [00011 dislocations. Finally, the C12/cl space group to which coesite belongs being centred, an additional slip system is observed: 1/6[(1) over bar2 (1) over bar3](01 (1) over bar1) (1/2[(1) over bar 10](110) in the monoclinic setting). |
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Language
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English
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Source (journal)
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European journal of mineralogy. - Stuttgart
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Publication
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Stuttgart
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2008
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ISSN
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0935-1221
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DOI
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10.1127/0935-1221/2008/0020-1849
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Volume/pages
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20
:4
(2008)
, p. 665-671
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ISI
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000262891900021
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Full text (Publisher's DOI)
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