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The lattice constant of a nonperfect crystal measured by X‐ray diffraction
Author(s) -
Leszczynski M.
Publication year - 1993
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/s0021889892011282
Subject(s) - lattice constant , diffraction , lattice (music) , x ray , bragg's law , x ray crystallography , crystal (programming language) , crystal structure , dynamical theory of diffraction , constant (computer programming) , condensed matter physics , bragg peak , position (finance) , physics , optics , materials science , crystallography , chemistry , acousto optics , diffraction grating , finance , computer science , acoustics , economics , programming language , beam (structure)
Computer simulations of X‐ray diffraction 008 Cu Kβ peaks for GaAs crystals with built‐in strains are presented. The work was done in order to find out how lattice disorder can influence the peak position used for a lattice‐constant evaluation. The simulations were performed using the dynamical theory of X‐ray diffraction for multilayered systems. Various models of lattice‐constant variation were considered. The results indicate that, for a crystal with microstrains, the peak is shifted towards a lower Bragg angle with respect to its position for a perfect crystal having the same lattice constant. The size of this shift as a function of lattice‐constant gradients and their spatial distribution are given. This will help in the analysis of experimental data obtained by X‐ray diffractometric measurements on mixed or microstrained crystals.