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Time‐of‐flight neutron transmission of mosaic crystals
Author(s) -
Santisteban Javier R.
Publication year - 2005
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889805028190
Subject(s) - mosaicity , reflection (computer programming) , crystal (programming language) , monochromator , materials science , optics , orientation (vector space) , crystallography , diffraction , physics , geometry , x ray crystallography , chemistry , wavelength , mathematics , computer science , programming language
The energy‐dispersive neutron transmission of mosaic crystals presents a series of dips in intensity as a result of reflection in the crystal planes. The positions of these dips can be exploited for the definition of the crystal orientation with a resolution of 1 min of arc. The widths of these dips depend on crystal orientation, on the reflection index, on the mosaicity, and on the incident‐beam divergence. The capability of the technique to define the orientation and mosaicity of a Cu crystal has been assessed through time‐of‐flight experiments. A Cu monochromator has been plastically deformed by uniaxial tension in situ , and the evolution of crystal orientation and mosaicity was tracked using the technique. Several crystal reflections at different locations of the sample were simultaneously studied during the experiment. A linear increase of mosaicity on deformation at an average rate of ∼5 min per percentage of shear strain was observed. The reorientation of the crystal as a result of the applied load showed variations across the specimen.