Theoretical analysis of structural and magnetic behavior of Ce doped nickel ferrite nanoparticles
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Date
2021-10
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Ferrites are magnetic materials having spinel structure. They are important because of their magnetic properties which make them applicable in various fields. Properties of ferrites depend upon the synthesis method, temperature, cation distribution, doping with different metal ions etc. In the present work, theoretical analysis of various structural and magnetic properties of Ce doped nickel ferrite nanoparticles NiCeyFe2-yO4 (Ce concentration y =0.01 to 0.08) has been done. Experimental data of X-Ray Diffraction, Mössbauer Spectroscopy and VSM has been taken from literature for structural analysis, cation distribution and saturation magnetization respectively. Ce ions being larger in size are assumed to occupy the octahedral sites. Different structural parameters like bond lengths, bond angles, site radii etc. were calculated assuming that all Ce ions are entering into the spinel lattice with increasing concentration. The calculated values show matching with experimental values only up to the 0.01 concentration of Ce. So it was concluded that Ce ions are not entering into the spinel lattice after the concentration of 0.01 but are moving toward grain boundaries. The cation distribution was again refined and structural and magnetic parameters were calculated which now show almost similar trend as the experimental values for all samples. Both theoretically and experimentally it was found that doping with Ce reduces the magnetization of nickel ferrite however there is difference between the calculated and experimentally observed values. Inclusion of some additional factors such as magnetic moment due to orbital motion and spin canting may give the possibility of getting same calculated values. This opens a scope for further experimental study of Ce doped ferrite samples.