Dislocation contrast by transmission electron microscopy A method for Burgers vector characterization if the invisibility criterion is not valid
- 1 March 1982
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 45 (3), 387-400
- https://doi.org/10.1080/01418618208236178
Abstract
The invisibility criterion for dislocations observed by TEM g · b=0, is strictly valid only for pure screw dislocations or pure edge dislocations if g · b ∧ u = 0. A criterion for quick discrimination between g · b = 0 and g · b ≠ 0 has been established for dislocations lying in an elastically isotropic medium if g · b ∧ u » 0 : on varying the deviation from the exact Bragg position, the dislocation image presents a stationary two-sided contrast if g · b=0; it presents a moving one-sided contrast if g · b ≠ 0. This criterion is used for characterization of Burgers vector of dislocations in feldspars. The validity of the criterion in elastically anisotropic medium is discussed.Keywords
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