What happened when small amount of tin is doped in nickel zinc ferrite initially the crystallite size decreases but with an increasing ratio of dopant (tin) the crystallite size increases why?
Dear Sabah Siddiq Ahmed,
The feature of changing crystallite size by dopoing NiZn ferrite by tin that you invistigated can be very complex and may be not connected with ionic radii of dopant element
Depending on experimental synthesis method different chemical or solid state chemical reaction can occure which affect on microstructure and crystal structure of powder or ceramics. Multi grain size distribution (small and large one together), stresses in crystal lattice change FWHM of peaks
I suggest to you investigate your diffraction patterns in detail by Williamson-Hall method, for example. It will helps to understand stresses in lattice parameter. Also SEM measurement should be done.
Maybe microstructure and dopping together can lead to this results that you observed in your samples
This speculations can be supported by results of the article where SnO2-NiO, SnO2-Fe2O3 systems are studied
DOI: 10.1016/S0169-4332(03)00274-5
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