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Figure 1
(a) The wavelength λ of the diffracted X-rays is proportional to the separation of the crystal planes d as described by Bragg's law. (b) Applying stress to the sides of the crystal causes the separation of the crystal planes to change from d to [d(1+\varepsilon_{{zz}})], where [\varepsilon_{{zz}}] is the strain owing to Poisson elongation. Supposing the stress is uniform and in the limits of linear elasticity, λ is expected to shift along with the separation of the crystal planes by a relative amount of [\varepsilon_{{zz}}]. The Cartesian and cylindrical coordinate systems used in this paper are presented on the left.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 4| July 2014| Pages 762-767
doi:10.1107/S1600577514011163
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