Study of swift heavy Ion irradiation induced effect on Gadolinium doped Nickel Ferrite
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Swift Heavy Ion Irradiation is very unique tool to modify the properties of material. Present work is an attempt to study the effect of 200 MeV Ag ion induced modification on structural and optical properties of 4% Gd doped Nickel ferrite nanoparticles. SRIM calculations showed that the electronic energy loss for 200 MeV Ag ions is much greater than threshold value. Therefore, columnar defects are expected to occur. The samples were synthesized by chemical route using citric acid. Structural and optical properties are studied using XRD, FTIR and UV-Vis Spectroscopy. XRD confirmed the cubic spinel structure of pristine and irradiated samples. After irradiation, crystallite size decreases while there is a slight increase in lattice parameter with increasing fluence. Lattice strain was found to increase with increasing fluence of irradiation. X-Ray Density does not change significantly at low fluences but decreases at high fluences which confirm the presence of defects in the sample after irradiation at high fluence. FTIR spectra also confirm pure spinel phase of the samples. Variation of FTIR band position and FWHM supports XRD result that significant changes in structural parameters can be observed at high fluence of irradiation. The reflectance spectra recorded by UV-Vis spectroscopy show two direct band gaps in all samples. The two band gap energies are due to the co-existence of high spin and low spin states. Both the band gaps were found to increase with irradiation fluence.
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