If structure like Titania having crystalline core and disordered layer or amorphous with specific surface area get decrease from 50 m2/g to 30 m2/g. definetly its particle size will increase but due to disorderness at the surface intensity of XRD will decrease and FWHM will increased so Crystallite size may be decreased. If any article anyone suggest Please give suggestion.
What about decreasing porosity which leads to decreasing surface area? Do you have any data related to the surface area (e.g BET analysis)? I guess, if this parameter (porosity) is not changed then after that you may link changes of surface area with particle size and its unique structure.
Please provide more detail about your experiments.
Of course since you do not get diffraction from the amorphous part (shell or sometimes core). In principle, that term crystal size is also a bit misunderstanding since only expresses the size of a coherently scattering volume. If you have a highly deformed material with dislocations walls, i.e. volumes of comparatively low dislocation density are seperated by zones of high dislocation density (walls) practically only the volumes between the walls are in diffraction condition, i.e. fulfill the requirement of a periodic arrangement of atoms, ions or molecules. Consequently, your grains are much bigger, but the peaks are broadened and deliver very small "crystals". This you can apply on your partially amorphous example.
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