微量粉塵中の石英に関するX線回折定量分析について

抄録

The principle of the method of the quantitative X-ray diffraction analysis, and the errors which may happen in the process of analysis were mentioned.
The relations between the particle-size of quartz powder and the reproducibility of X-ray diffracted intensities were examined both in enough amount and in submicro amount of samples. And we made the. calibration curve of quartz (about 2μ) in submicro amount of samples (total weight including the internal standard material: about 2mg.), and estimated the errors in these cases.
This X-ray diffraction analysis method is “Internal Standard Method” using fluorite powder as the internal' standard material and calcite powder as the diluent for quartz (in our case, quartz+calcite=about lmg.). The measurements of the X-ray diffracted intensity-ratio of quartz to fluorite were performed by the Fixed Counts Method (FCM).
From the result by the FCM (total counts: 30, 000) we could recognize the extent of the error may be about ±5%.
But the X-ray diffracted intensity of quartz differs from the crystallite- or particle-size, and on determining of quartz percent in an unknown sample, therfore, if we do not consider of the particle-size and not compensate the intensity, the result obtained just using our calibration curve of quartz (2μ) may give a larger error. The studies on this point may be performed later.