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Complete sets of factors for absorption correction and air scattering subtraction in X-ray powder diffraction of loosely packed samples

Published online by Cambridge University Press:  10 January 2013

Stefano Ottani ,
Pietro Riello  and
Stefano Polizzi
Stefano Ottani
Affiliation:
C.N.R., Centro Studi Fisica Macromolecole, Via Selmi 2, 40126 Bologna, Italy
Pietro Riello
Affiliation:
Dipartimento di Chimica Fisica, Universita' degli Studi di Venezia, Calle Larga S.Marta 2137, 30123 Venezia, Italy
Stefano Polizzi
Affiliation:
Dipartimento di Chimica Fisica, Universita' degli Studi di Venezia, Calle Larga S.Marta 2137, 30123 Venezia, Italy
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Abstract

Complete sets of correction factors for absorption and air scattering effects in X-ray powder diffraction are reported. Both symmetrical reflection and transmission techniques are considered and boundary conditions to be tested for any given value of scattering angles are listed. This may prove particularly useful on coding computer programs for correction of raw intensity data files. Effects of interstitial volume on correction for absorption and subtraction of air scattering were investigated. For samples of high interstitial volume, like loosely packed powders or aerogels, the contribution from air trapped inside the specimen is significant and leads to expressions of the air scattering correction factors different from those commonly reported in the literature.

Type
Research Article
Information
Powder Diffraction , Volume 8 , Issue 3 , September 1993 , pp. 149 - 154
Copyright
Copyright © Cambridge University Press 1993

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