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Determination of Crystallite Size with the X‐Ray Spectrometer

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2 Author(s)
Alexander, Leroy ; Department of Research in Chemical Physics, Mellon Institute, Pittsburgh, Pennsylvania ; Klug, Harold P.

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The accuracy of the Scherrer crystallite size equation is limited in part by the uncertainty in β, the experimentally deduced pure diffraction broadening. Currently used procedures for estimating β from the observed breadth of a Debye‐Scherrer line are not, in general, applicable to the x‐ray spectrometer. By making use of a scheme of convolution analysis for analyzing the effect of geometrical factors in broadening the pure diffraction contour, a correction curve is developed for determining β from the experimentally measured line breadths b and B (Jones' notation). The degree of reliability of this correction procedure is ascertained by applying Stokes' direct Fourier transform procedure for determining the form of the pure diffraction contour free of instrumental effects. Suggestive procedures are given for crystallite size determination with the x‐ray spectrometer in different size ranges, and several examples are described.

Published in:

Journal of Applied Physics  (Volume:21 ,  Issue: 2 )

Date of Publication:

Feb 1950

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