WAXS Crystallinity for Undistorted Crystals

Undistorted crystals are not found in nature. So the principle discussed here is only a fundament for further reasoning. Every elecflon in the sample is scattering X-rays by the same amount into some direction in reciprocal space. Thus, the integral of the scattering intensity 

If the material is divided in a crystalline and an amorphous phase, and the crystals are undistorted with atoms fixed at their ideal positions in space, the integral 

Because we are relating masses to each other, the determined crystallinity is the weight crystallinity Wc, not the volume crystallinity, v.  

Precision determinations of Wc by means of WAXS measurements are carried out by the Ruland [14] method. The method is sufficiently described in textbooks [7, 22]. A modified version adapted to automatic processing by a computer has been introduced by Vonk [108]. 

---