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Quantification of phases with partial or no known crystal structures

Published online by Cambridge University Press:  01 March 2012

Nicola V. Y. Scarlett  and
Ian C. Madsen
Nicola V. Y. Scarlett
Affiliation:
CSIRO Minerals, Box 312, Clayton South, Victoria, 3169, Australia
Ian C. Madsen
Affiliation:
CSIRO Minerals, Box 312, Clayton South, Victoria, 3169, Australia
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Abstract

Quantification of mixtures via the Rietveld method is generally restricted to crystalline phases for which structures are well known. Phases that have not been identified or fully characterized may be easily quantified as a group, along with any amorphous material in the sample, by the addition of an internal standard to the mixture. However, quantification of individual phases that have only partial or unknown structures is carried out less routinely. This paper presents methodology for quantification of such phases. It outlines the procedure for calibration of the method and gives detailed examples from both synthetic and mineralogical systems. While the method should, in principle, be generally applicable, its implementation in the TOPAS program from Bruker AXS is demonstrated here.

Keywords

powder diffractionRietveldquantitative phase analysis

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Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 4 , December 2006 , pp. 278 - 284
Copyright
Copyright © Cambridge University Press 2006

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