Hi there,
I want to get some help, if anyone has already explained and improved the correlation between the crystallite size results and particle size measured by laser granulometry.
I have used the two techniques to have an idea about the size of particles before and after the ball milling, thus the answers are similar, but I need some explication to link the results.
All the best,
Mohamed
Mohamed Elmouhinni , The two techniques do measure different properties.
The laser diffraction experiment is a result of the overall size and shape (and their distribution) of the particles. You would get the same information if the particle is a single crystal or consists of many small crystallites that are conglomerated into a large particle, as long as the overall shape is the same.
With wide angle (xray/neutron/electron) diffraction the width of the Bragg peaks depends on the size of structurally coherent domains, meaning volumes inside your crystal in which the lattice planes are all nicely periodic in their distance. Roughly speaking you could assume/hope that this relates to the diameter of the individual crystallites. These diffraction experiments can result in a much smaller "size" than the laser granulometry if the particle is an agglomerate of small crystalltes.
Small angle scattering (xrays or neutrons) on the other hand is more similar to the laser diffraction experiment and yields information on the overall particle size and shape.
Thus you cannot compare and relate the results, as very different properties are measured.
If your XRD data yield the same size as the laser granulometry, then it appears that your particles are essentially good single crystals and defects like microstrain, internal cracking etc introduced by the ball milling process may have broken the original crystals into smaller peaces but each particle is pretty much a "reasonably good" single crystal.
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