RIR-based quantitative phase analysis of crystal polymorphism

TiO2 is widely used in white pigments, electronics materials, optical catalysts and UV absorbents. It exists in three polymorphs: rutile, anatase and brookite. The efficiencies of rutile and anatase as optical catalysts are different, so a method to determine the rutile:anatase ratio is needed. The quickest way to do quantitative XRD analysis is to determine the RIR (Relative Intensity Ratio). Data from the MiniFlex, profiled below, is of a prepared mixture of rutile and anatase in a 3:1 ratio. Using Jade to apply profile fitting algorithms, integrated intensities of several peaks were determined. The result showed rutile at 71.6 wt% and anatase at 28.4 wt%, which are approximately consistent with the ideal values of 75% and 25% respectively. This method is widely used as a simple, quick way to perform quantitative analysis.


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New sixth generation MiniFlex X-ray diffractometer (XRD) is a multipurpose analytical instrument that can determine: phase identification and quantification, percent (%) crystallinity, crystallite size and strain, lattice parameter refinement, Rietveld refinement, and molecular structure. It is widely used in research, especially in material science and chemistry, as well as in industry for research and quality control. It is the newest addition to MiniFlex series of benchtop X-ray diffraction analyzers from Rigaku, which began with the introduction of the original MiniFlex system decades ago. Read more...

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