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Effect of microabsorption on the determination of amorphous content via powder X-ray diffraction

Published online by Cambridge University Press:  22 March 2018

Nicola V. Y. Scarlett  and
Ian C. Madsen
Nicola V. Y. Scarlett*
Affiliation:
CSIRO Mineral Resources, Box 312 Clayton South, Victoria 3169, Australia
Ian C. Madsen
Affiliation:
CSIRO Mineral Resources, Box 312 Clayton South, Victoria 3169, Australia
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

Powder X-ray diffraction has become a routine procedure for the quantification of phases in mixtures. The most common method for this measurement is the Rietveld method, which generally returns the relative weight percentages of the crystalline components within the mixture. However, in many instances, it is also desirable to obtain an estimate of the amorphous content of a sample. There are several methods that may be used for this measurement and their accuracy has been assessed previously with a number of ideal, synthetic mixtures. Many samples, especially in the mineralogy sphere, are far from ideal and contain multiple phases of varying absorption contrast. This creates a microabsorption problem which affects the accuracy of the determination of both the crystalline and amorphous components. This paper assesses commonly used methods of amorphous determination with a series of synthetic samples designed to create a considerable microabsorption problem.

Keywords

powder X-ray diffractionX-ray diffractionquantitative phase analysisquantitative phase analysisamorphous
Type
Technical Articles
Information
Powder Diffraction , Volume 33 , Issue 1 , March 2018 , pp. 26 - 37
Copyright
Copyright © International Centre for Diffraction Data 2018 

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