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- W2894780785 abstract "A simplified crystallographic model of quartz is proposed. Only Si atoms are represented and each Si is assumed to be bound to its first four Si neighbours by covalent bonds (representing the true Si — O — Si bonds) along the directions of an sp3 hybridization. Using this approach, it becomes possible to look for possible dissociations of dislocations which govern the plastic behaviour. For a dislocations, dissociation into two colinear partials (a → 1/2 a + 1/2 a) is possible in the planes {1010} and {1011} which can thus be glide planes. For the basal plane which is generally assumed to be the easiest glide plane, comparison with Brazil twins suggests that a low fault energy can be obtained if the fault displacement is distributed over several parallel planes, leading to a zonal dissociated dislocations. All these models are confirmed by T. E. M. observations in weak beam conditions. They allow several features of low temperature deformation to be understood (formation of microtwins, high strain hardening and severe increase of the dislocation density during basal a glide) . Another possibility to deduce the possible glide systems of quartz consists in the systematic study of the subgrain boundaries owing to the Frank's formula for the theoretical predictions and by T. E. M. observations for the experimental part of this work. Observations on annealed samples of naturally deformed quartz exactly correspond to the theoretical predictions. This confirms that possible glide systems for quartz are a glide in {0001}, {1010} and {1011} and c glide in {1210} ." @default.
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- W2894780785 date "1979-01-01" @default.
- W2894780785 modified "2023-10-18" @default.
- W2894780785 title "Plasticity of quartz : crystallographic models and T. E. M. observations" @default.
- W2894780785 doi "https://doi.org/10.3406/bulmi.1979.7267" @default.
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