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Quantitative Analysis: A Comparative Study Using Mo and Cu Radiation on Coal Related Minerals and Fly Ash

Published online by Cambridge University Press:  06 March 2019

J. Amenson ,
J. Benson ,
T. Demirel  and
R. Jacobson
J. Amenson
Affiliation:
Ames Laboratory-USDOE and Iowa State University, Ames, Iowa 50011
J. Benson
Affiliation:
Ames Laboratory-USDOE and Iowa State University, Ames, Iowa 50011
T. Demirel
Affiliation:
Ames Laboratory-USDOE and Iowa State University, Ames, Iowa 50011
R. Jacobson
Affiliation:
Ames Laboratory-USDOE and Iowa State University, Ames, Iowa 50011
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Abstract

Our experience using Mo Kα radiation in coal related research indicates that minerals can be detected and quantitatively measured at the 0.2% level in an amorphous substance such as coal. Since the linear absorption coefficient for most elements is about a factor of eight lower for Mo radiation than it is for Cu radiation, the matrix affect is greatly reduced and the intensity is a more linear function of concentration.

Although there is considerable overlapping of peaks when complex mixtures are analyzed using Mo radiation, the use of second derivative techniques to locate peaks, and least squares techniques to fit peaks can resolve many of these problems. The reduced time needed to collect a diffraction pattern, and the increased intensity obtained more than compensate for the extra computer time needed to analyze the data.

Type
IV. Quantitative Phase Analysis by XRD
Information
Advances in X-Ray Analysis , Volume 27: Thirty-Second Annual Conference on Applications of X-ray Analysis, August 1-5, 1983 , 1983 , pp. 349 - 354
Copyright
Copyright © International Centre for Diffraction Data 1983

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References

1. Chung, F. H., “Quantitative Interpretation of X-ray Diffraction Patterns of Mixtures, I. Matrix-Flushing Method for Quantitative Multicomponent Analysis,” J. Appl. Cryst. (7), 519 (1974).Google Scholar
2. Chung, F. H., “Quantitative Interpretation of X-ray Diffraction Patterns of Mixtures. II. Adiabatic Principle of X-ray Diffraction Analysis of Mixtures,” J. Appl. Cryst. (7), 526 (1974).Google Scholar