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Strategies for Preferred Orientation Corrections in Xray Powder Diffraction Using Line Intensity Ratios

Published online by Cambridge University Press:  06 March 2019

B.H. O'Connor ,
D.Y. Li  and
H. Sitepu
B.H. O'Connor
Affiliation:
Department of Applied Physics/Centre for Materials Technology Ciirtin University of Technology Perth, WA, Australia
D.Y. Li
Affiliation:
Department of Applied Physics/Centre for Materials Technology Ciirtin University of Technology Perth, WA, Australia
H. Sitepu
Affiliation:
Department of Applied Physics/Centre for Materials Technology Ciirtin University of Technology Perth, WA, Australia
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Abstract

Li et al (1990) reported experiments with gibbsite powder specimens on the use of Rietveld pattern-fitting, involving the March preferred orientation model, to characterise preferred orientation according to the March r parameter. It was shown that intensity corrections may be applied with the March r parameter derived from Rietveld analysis or with the related line intensity ratio MR which is sensitive to preferred orientation. The present paper reports an analytic expression involving r and MR which has proved highly reliable for the correction of preferred orientation bias in quantitative phase analysis of gibbsite. Similar expressions may be readily derived for other materials for which the March model is appropriate. Therefore the line ratio approach has considerable potential for rapid correction of intensities for preferred orientation.

Type
VIII. Qualitative and Quantiative Phase Analysis by XRD
Information
Advances in X-Ray Analysis , Volume 34: Thirty-Ninth Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1990 , 1990 , pp. 409 - 415
Copyright
Copyright © International Centre for Diffraction Data 1990

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References

Cullity, B. D., 1978. “Elements of x-ray diffraction”. 2nd ed., Addison-Wesley, Reading, Massachusetts, pp 502–503.Google Scholar
Dollase, W. A., 1986. “Correction of intensities for preferred orientation in powder diffractometry: application of the March model.” J. Appl Cryst., 19:267–272.Google Scholar
Li, D. Y., B. H., O'Connor, Roach, G. I. D. and Cornell, J. B., 1990. “Use of x-ray powder diffraction patternfitting for characterising preferred orientation gibbsites.” Powd. Diff., 5: 79–85.Google Scholar
March, A., 1932. “Mathcmatische theorie der regelung nach der korngestalt bei affiner deformation.” Z., Kristallogr., Kristallgeom., Kristallphys., Kristailchem., 81:285–297.Google Scholar