Are crystallite size and particle size are the same?
If not, then how can particle size be calculated from XRD data?
Google your question in combination with Resarchgate and you get numerous questions on the same subject with for instance the following title
Can anyone clarify the difference between Grain size, particle size and crystallite size?
What is the difference between crystallite size, grain size, and particle size?
What is the relation among crystallite size, grain size and particle sze?
What is particle size, crystalline size, grain size?
Why is there a difference in the crystalline size of the nanoparticle as measured from TEM image and XRD analysis of the same sample?
As Harry ten Brink already mentioned there are already several questions touching this topic. Nevertheless, a short answer.
As the terminology already explains a particle is assymed to be a homogeneous object, but it can consist of many subobjects like crystals of the same or different phases, amorphous as well as crystalline. A crystallite however is a single-crystalline individuum of a very small size. Crystal and crystallite are terms expressing the somehow the same. The later only points out that the (small) size of a specific characteristic.
Thanks Gert Nolze.
Hi Harry Ten Brink, simply my question is how we can find the particle size via XRD?
As far as I know, you cannot find the particle size by XRD but only the average crystallite size applying the Scherrer equation. If you have a bulk material (e.g. a ceramic or metallic sample) consisting nano-crystals, it is practically a "single particle" which size you cannot determine.
average crystallite size using the Scherrer equation and particle size from TEM image.
one always calculates by scherrer formula only the 'coherently scattering crystallite size' in xrd analysis...
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crystallite size and particle size
XRD studies only gives the crystalline size not the particles size. In order to determine the particles size, TEM or DLS studies are usefull.
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