Monochromator features

With the MiniFlex300/600, it is possible to install a graphite monochromator for a scintillation counter, of the type used in high-grade, standalone, general-purpose equipment. By using a monochromator, it is possible to obtain an X-ray diffraction pattern with high P/B ratio because the monochromator can remove interfering components such as continuous X-rays produced by the X-ray tube, Kβ-rays, and fluorescent X-rays from the sample. Fig. 1 shows the X-ray diffraction pattern for hematite, measured using the Kβ filter method and the graphite monochromator method. The large reduction in background makes it possible to observe very weak peaks as illustrated by the inset box between 38 and 40°. This makes identification of trace phases much easier.

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Fig. 1: X-ray diffraction pattern for hematite,
measured with the Kβ filter method and
graphite monochromator method

Fig. 2 shows the X-ray diffraction pattern and qualitative analysis results for Fe oxide, measured using a graphite monochromator. By using a graphite monochromator, it is possible to obtain an X-ray diffraction pattern with an extremely low background, and thereby detect trace components.

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Fig. 2: Results of qualitative analysis of Fe oxide (hematite content 1.6 mass%)

Apparatus condition:

Apparatus conditions: MiniFlex600 (F.F tube 40 kV 15 mA), Detector: Scintillation counter (monochromater), Slit conditions: DS / SS = 1.25°, RS = 0.3 mm, Incident side and receiving side Soller slit: 5°, Incident height limiting slit = 10 mm

Measurement condition:

Scan range: 2θ = 10 ~ 70°, Step width: 0.02°, Scan speed: 4° / min. (about 15 min.)


MiniFlexNew 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 about Rigaku's MiniFlex...

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