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Size–strain separation in diffraction line profile analysis
Author(s) -
Scardi P.,
Ermrich M.,
Fitch A.,
Huang E-Wen,
Jardin R.,
Kuzel R.,
Leineweber A.,
Mendoza Cuevas A.,
Misture S. T.,
Rebuffi L.,
Schimpf Christian
Publication year - 2018
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/s1600576718005411
Subject(s) - diffraction , synchrotron radiation , materials science , optics , bragg's law , beamline , bragg peak , synchrotron , radiation , scattering , physics , beam (structure)
Separation of size and strain effects on diffraction line profiles has been studied in a round robin involving laboratory instruments and synchrotron radiation beamlines operating with different radiation, optics, detectors and experimental configurations. The studied sample, an extensively ball milled iron alloy powder, provides an ideal test case, as domain size broadening and strain broadening are of comparable size. The high energy available at some synchrotron radiation beamlines provides the best conditions for an accurate analysis of the line profiles, as the size–strain separation clearly benefits from a large number of Bragg peaks in the pattern; high counts, reliable intensity values in low‐absorption conditions, smooth background and data collection at different temperatures also support the possibility to include diffuse scattering in the analysis, for the most reliable assessment of the line broadening effect. However, results of the round robin show that good quality information on domain size distribution and microstrain can also be obtained using standard laboratory equipment, even when patterns include relatively few Bragg peaks, provided that the data are of good quality in terms of high counts and low and smooth background.