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Expanded Use of the Rietveld Method in Studies of Phase Abundance in Multiphase Mixtures*

Published online by Cambridge University Press:  10 January 2013

R.J. Hill
R.J. Hill
Affiliation:
CSIRO Division of Mineral Products, P.O. Box 124, Port Melbourne, Victoria, 3207, Australia
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Abstract

Simple relationships exist between the individual phase scale factors derived from Rietveld analysis of multiphase mixtures and (i) the ‘reference intensity ratio’ used in traditional methods of discrete-peak phase analysis, (ii) the phase abundance itself and (iii) the relative pattern intensities in simulated powder patterns. These relationships are shown to follow naturally from the fundamental integrated-intensity phase-analysis equations provided in standard texts. In the event that preferred orientation, crystallinity, extinction and/or microabsorption cannot be adequately incorporated into the Rietveld models for individual phases, it is demonstrated that the Rietveld ab initio ‘pattern intensity constants’ can be scaled/calibrated experimentally, as in other whole-pattern methods of analysis, while retaining all the advantages of the Rietveld method.

Type
Research Article
Information
Powder Diffraction , Volume 6 , Issue 2 , June 1991 , pp. 74 - 77
Copyright
Copyright © Cambridge University Press 1991

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