Influence of 50 MeV Lithium Ion Irradiation on Hyperfine Interactions of Cr0.5 Li0.5 Fe2O4 |
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Authors: | S G Parmar Ravi Kumar R G Kulkarni |
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Institution: | (1) Department of Physics, Saurashtra University, Rajkot, 360005, India;(2) Nuclear Science Centre, New Delhi, 110067, India;(3) Physics Department, Shivaji University, Kolhapur, 416004, India |
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Abstract: | Spinel oxide Cr0.5 Li0.5 Fe2O4 has been irradiated at Nuclear Science Centre, New Delhi, by 50 MeV lithium ions of fluence 5*1013 ions/cm2 and irradiation effect on hyperfine interactions has been investigated by Mossbauer spectroscopy. The Mossbauer spectrum
of irradiated sample shows no paramagnetic doublet contribution and the hyperfine fields corresponding to the Fe3+ in the octahedral (B) and the tetrahedral (A) sites are very well separated. That is the observed superimposed A and B sites
in unirradiated sample are split into separate lines after Li irradiation. Further an increase of the intensity of the lines
(2)–(5) with respect to (1)–(6) signals an orientation of the hyperfine magnetic field towards a direction perpendicular to
the ion path due to the irradiation induced strain by the latent tracks. The computer simulation of Mossbauer spectra indicated
that the irradiated Fe3+-site occupancy of the A-site hyperfine field increased from 43% to 55% whereas the B-site hyperfine field decreased from
57% to 45% compared to unirradiated sample. |
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