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Difference patterns, obtained using two or more wavelengths to exploit the anomalous scattering of specific elements in the sample, can provide a valuable adjunct to conventional methods of qualitative and quantitative powder diffraction analysis. A preliminary investigation of this method has been made, using a sample containing 6% by weight Co3O4 in a matrix of kaolinite [Al2Si2O5(OH)4]. It was found that, by using Co and Co radiations, the Bragg reflections from the Co3O4 could be isolated and this difference pattern used to make quantitative analyses accurate to ± 1%. These results indicate that for many problems, especially those involving compounds of transition metals, the use of this technique is feasible in a conventional X-ray laboratory and does not require access to a synchrotron radiation source.
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