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A scale factor γ, to convert from the relative to the absolute/relative intensity scale, is readily calculated during computer simulation of powder patterns. Previously used scale factors are related to γ. The Reference Intensity Ratio, I/Ic (c = corundum), is obtained from μ, ρ, and γ for the sample and for corundum. Comparing calculated and experimental I/Ic values confirms that microabsorption and primary extinction can be serious experimental aberrations possibly limiting the accuracy to several wt.% in quantitative analysis by powder diffraction.
Hubbard et al. (Thu,) studied this question.
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