Reason for increase of unit cell volume with decrease of crystallite size
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how to you perfom your experiment, what size difference. Do you mean Ti or Ti(4+). I am confinced that both will not be able to replace Zn(2+) in the lattice. Without knowing the procedure (chemical leads to solvents) I guess that a Ostwald ripening of the ZnO occurs. Often a supperpostion of the XRD's is a meaningful comparison (better than Scherrer(. E.g. the 002 reflex is quitesensitive to a variation in the aspect ratio.
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