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Full local elastic strain tensor from Laue microdiffraction: simultaneous Laue pattern and spot energy measurement
Author(s) -
Robach Odile,
Micha JeanSébastien,
Ulrich Olivier,
Gergaud Patrice
Publication year - 2011
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/s002188981102320x
Subject(s) - microbeam , optics , monochromatic color , crystal (programming language) , beam (structure) , physics , energy (signal processing) , materials science , detector , computer science , programming language , quantum mechanics
In sample‐scanning Laue microdiffraction, the local crystal orientation and local deviatoric strain tensor are obtained by illuminating the polycrystalline sample with a broadband `white' (5–30 keV) X‐ray microbeam and analyzing the spot positions in the resulting local Laue pattern. Mapping local hydrostatic strain is usually slower, owing to the need to alternate between white and tunable‐energy monochromatic microbeams. A technique has been developed to measure hydrostatic strain while keeping the white beam. The energy of one of the Laue spots of the grain of interest is measured using an energy‐dispersive point detector, while simultaneously recording the Laue pattern on the two‐dimensional detector. The experimental spot energy, E exp , is therefore measured at the same time as E theor , the theoretical spot energy for zero hydrostatic strain, which is derived from the analysis of the Laue pattern. The performance of the technique was compared with that of the monochromatic beam technique in two test cases: a Ge single crystal and a micrometre‐sized UO 2 grain in a polycrystal. Accuracies on the hydrostatic strain Δ a / a of ±0.4 × 10 −4 and ±1.3 × 10 −4 were obtained for Ge and UO 2 , respectively. Measurement strategies to limit the remaining uncertainties on E theor are discussed.