X-ray powder diffraction is a fast method for determining the phase content of polycrystalline material. Every material exhibits a typical ‘X-ray fingerprint’, which is stored in databases such as the ICDD PDF2 or PDF4. This fingerprint is utilized in the DIFFRAC.EVA software for phase identification. Furthermore, automatic scaling of the patterns from the database relative to the measured intensities gives the semi-quantitative phase composition.
Pulverized geological material was measured with the D2 PHASER. Experimental details are summarized in Table 1. Figure 1 shows a zoomed region (intensities are cut at about 10% of the maximum intensity) of the diffraction data together with the result of the phase identification. The data, collected within 45 minutes, show a very good counting statistics. Minor phases of less than 1 wght-% are clearly identified.
Table 1. Experimental settings.
|D2 PHASER, LYNXEYE detector
|Cu radiation (30 kV, 10 mA), Ni filter
|Continuous scan from 3.0 to 55.0° 2Theta
Step width 0.02°
counting time 1 sec per step
|Total scan time about 45 min.
|2.5° Soller collimators, 0.6 mm divergence slit,
|LYNXEYE detector opening 5° 2Theta
Figure 1. Phase identification of geological material with DIFFRAC.EVA. The major phase is gypsum. Semiquantitative phase analysis gives the content of the minor phases: quartz (7.2%), muscovite (0.9 %), dolomite (2.1 %), and chlorite (1.0 %).
Using the D2 PHASER the value of the investigated geological sample for use in building materials could immediately be shown.
This information has been sourced, reviewed and adapted from materials provided by Bruker X-Ray Analysis.
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