Articles | Volume 36, issue 5
https://doi.org/10.5194/ejm-36-709-2024
https://doi.org/10.5194/ejm-36-709-2024
Research article
 | 
04 Sep 2024
Research article |  | 04 Sep 2024

Dauphiné twin in a deformed quartz: characterization by electron channelling contrast imaging and large-angle convergent-beam diffraction

Nobuyoshi Miyajima, Danielle Silva Souza, and Florian Heidelbach

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Cited articles

Barber, D. J. and Wenk, H. R.: Dauphiné twinning in deformed quartzites: Implications of an in situ TEM study of the α-β phase transformation, Phys. Chem. Miner., 17, 492–502, https://doi.org/10.1007/BF00202229, 1991. 
Cordier, P. and Doukhan, J. C.: Plasticity and dissociation of dislocations in water-poor quartz, Philos. Mag. A, 72, 497–514, https://doi.org/10.1080/01418619508239935, 1995. 
Cordier, P., Morniroli, J. P., and Cherns, D.: Characterization of Crystal Defects in Quartz by Large-Angle Convergent-Beam Electron-Diffraction, Philos. Mag. A, 72, 1421–1430, https://doi.org/10.1080/01418619508236266, 1995. 
Cocuzzi, D. A. and Laughner, J. W.: Effects of surface abrasion and impurity levels on stress-induced Dauphine twinning in alpha quartz, Proceedings of the 43rd Annual Symposium on Frequency Control, Denver, CO, USA, 31 May–2 June 1989, pp. 617–622, https://doi.org/10.1109/FREQ.1989.68923, 1989. 
Goltrant, O., Cordier, P., and Doukhan, J.-C.: Planar deformation features in shocked quartz; a transmission electron microscopy investigation, Earth Planet. Sc. Lett., 106, 103–115, https://doi.org/10.1016/0012-821X(91)90066-Q, 1991. 
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Short summary
Dauphiné twin (DT) domains in a deformed quartz were visualized for the first time by using orientation-optimized electron channelling contrast imaging under Bragg conditions of the rhombohedral planes. The different contrast of a pair of DT domains in the backscattered electron images originates not from a misorientation between the two domains but from different diffraction intensities between positive and negative rhombohedral planes in quartz.
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