SPECTROSCOPY 55


A multiphase sample. This sample was run more slowly than the others to get higher intensity, which makes it easier to effectively identify many of the peaks. Major phases include quartz, halite, clinochlore and either illite or muscovite


Data set 3 required a longer data collection time, since the peaks were not as intense as in the other samples. Te data presented has been smoothed and background corrected. Te stick patterns of the best search/ match results from the PDF file are printed below each scan. ‘Good’ search/match results match both the position and the intensity ratio of peaks, and there will be no unidentified peaks. Since many compounds have


similar crystal structures, search/ match results will list several ‘good’ matches. Additional information may be needed to definitively identify a phase. A modern benchtop X-ray diffractometer such as the


Rigaku MiniFlex, combined with a modern analytical software package, is an effective tool for phase identification of unknown mineral samples. Clear interpretation of the presence or absence of various phases may be performed quickly and with a high degree of confidence. Phase identification was easily performed, even with quick data collection scans that have


high statistical noise. Specimen preparation for most standard materials was minimal since chunk materials – as well as powder samples – can be analysed. Note that phase identification is a primary step in an analysis. Further quantitative analysis may be performed using the same analysis software.


For more information ✔ at www.scientistlive.com/eurolab


Robert C. Tisdale is with Rigaku. www.rigaku.com


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