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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/34616
Record Status
Checked
Record Id
34616
Title
Phase imaging using time-of-flight neutron diffraction
Contributors
M J Gutmann (ISIS)
,
W Kockelmann (ISIS)
,
L C Chapon (ISIS)
,
P G Radaelli (ISIS)
Abstract
A technique that allows the spatial distribution of crystallographic phases in the interior of an object to be reconstructed from neutron time-of-flight (TOF) diffraction is described. To this end, the shift of the Bragg peaks due to the socalled ?geometrical aberration? is exploited. A collimated incident white beam is used to perform a translational or rotational scan of the object whilst collecting a TOF data set for each sample position or orientation. Depending on the location of any scattering material along the line of the incident beam path through the object, the measured d-spacings of the corresponding Bragg peaks are shifted with respect to their nominal values, which are attained only at the geometrical centre of the instrument. Using a formula that is usually employed to correct for sample offset, the phase distribution along the incident beamline can be directly reconstructed, without the need to perform a tomographic reconstruction. Results are shown from a demonstration experiment carried out on a cylindrical Al container enclosing an arrangement of Cu and Fe rods. On the basis of this formalism, an optimized experimental geometry is described and the potential and limits of this technique are explored, as are its applicability to X-ray and constant-wavelength neutron diffraction.
Organisation
CCLRC
,
ISIS
,
ISIS-SXD
Keywords
Physics
,
ISIS 2006
Funding Information
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Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
J Appl Crystallogr
39, no. 1 (2006): 82-89.
doi:10.1107/S0021889805041580
2006
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