Tables for
Volume H
Powder diffraction
Edited by C. J. Gilmore, J. A. Kaduk and H. Schenk

International Tables for Crystallography (2018). Vol. H, ch. 3.6, p. 289

Section Definitions

M. Leonia*

aDepartment of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano 77, 38123 Trento, Italy
Correspondence e-mail: Definitions

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In the following, the diffraction peaks for a powder will be described in reciprocal space with reference to the Bragg position [d_{\{ hkl\}}^*] expected for the {hkl} reflection family in the absence of any type of defect. The coordinate s, where[s = d^* - d_{\{ hkl \}}^* = {2 \over \lambda}\left(\sin \theta - \sin\theta _{ \{ hkl \}} \right), \eqno (3.6.3)]will be employed. Moving from reciprocal to diffraction space (`2θ space') involves a trivial but nonlinear change of variables: peaks that are symmetrical in reciprocal space will become asymmetrical in 2θ space and vice versa.

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