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Determination of the amorphous portion of a sample

The literature describes two methods to determine the amorphous portion of a sample using the XRD:
-Internal Standard
 By adding a known quantity of a standard substance, it is possible to calibrate the amount of the crystalline substance and thus to determine the amorphous part.
-by evaluating the underground halo
 By adjusting the the background, the crystalline intensity and the total intensity are determined. The difference between the two sum intensities depends on the amount of amorphous phases in the sample.

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