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RIR - Measurement and Use in Quantitative XRD

Published online by Cambridge University Press:  10 January 2013

Camden R. Hubbard
Ceramics Division, National Bureau of Standards, Gaithersburg, Maryland 20899, U.S.A.
Robert L. Snyder
New York State College of Ceramics, Alfred University, Alfred, New York 14802, U.S.A.
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The Reference Intensity Ratio (RIR) is a general, instrument-independent constant for use in quantitative phase analysis by the X-ray powder diffraction internal standard method. When the reference standard is corundum, RIR is known as I/Ic; These constants are collected in the Powder Diffraction File (1987), can be calculated, and can be measured. Recommended methods for accurate measurement of RIR constants are presented, and methods of using these constants for quantitative analysis are discussed. The numerous, complex constants in Copeland and Bragg's method introduced to account for superimposed lines can be simply expressed in terms of RIR constants and relative intensities. This formalism also permits introduction of constraints and supplemental equations based on elemental analysis.

Research Article
Copyright © Cambridge University Press 1988


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