CRYSTALLINITY ANALYSIS
This page explains the commands for the analysis of the degree of crystallinity. It can be performed only on X-ray powder diffraction patterns and it is based on profile fitting with a model composed by a series of gaussian curves superposed to background. The type of curve can be changed into Lorentian or PseudoVoigt by using the command peakfun. The contribution of the crystalline components in the patterns is quantified. Note that profiles should be preprocessed without removing the background before starting the crystallinity analysis. The command is:
cryst
Specifies the parameters for crystallinity calculations. Two integer numbers should follow the command:
the first number determines the sensitivity in finding peaks in the diffraction profile. Default value is 20. Higher values mean less sensitivity (less peaks found), lower values mean higher sensitivity (more peaks found).
the second number determines the clipping window for background determination. Default value is 100. Higher values mean more flat background, lower values mean background entering into the peaks.
A different calculation is performed if the first number is negative. In this case the crystallinity is calculated by considering the intensity counts after a background subtraction step, without any fitting procedure performed. The second number still determines the clipping windows for background determination.
