As the driving force may be reduction of surface energy and can be exchange interaction but still I am not sure that some NP showing bigger grains with higher lattice strain.
Crystallite size and grain size are two different entities
Crystallite size is calculated using Bragg's equation (nλ = 2d sinθ), whereas Grain (or particle) size can be assessed from SEM images.
For nanoparticles, the crystallite size and grain size may be nearly same. The difference is observed because the nanoparticles formed are not completely crystalline.
You may refer to the XRD section following article for a relation between crystallite size and lattice strain:
Article Effect of Cu-N co-doping on the dielectric properties of ZnO...
Hope this helps.
Thank you respected @Manpreet Kaur for your answer to my question!!
But what I am asking is what forces to make a bigger grain?
And what restricts to a small grain?
Accordingly then why bigger grains have high lattice strain??
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