50 MeV Li3+ ion irradiation induced modifications in structural and magnetic properties of Ti4+-substituted Li–Al and Li–Cr ferrites

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Using 50 MeV Li3+ ion irradiation, the change induced in polycrystalline ferrites Li0.5(1+x)TixAl0.1Fe2.4 − 1.5xO4 (x = 0.0 to 0.3, step–0.1)[LTAF] and Li0.5(1+x)TixCr0.1Fe2.4 − 1.5xO4 (x = 0.0 to 0.3, step–0.1; LTCF) in the electronic stopping power regime is studied. Both the systems were irradiated with the same fluence of 5 × 1013 ions/cm2. The modifications of the structural and magnetic properties are studied by means of X-ray diffraction (XRD), magnetization, 57Fe Mössbauer spectroscopy and low field a. c. susceptibility. The contrast in the role of Ti4+ in the presence of Al3+ and Cr3+ causing the formation of paramagnetic centres through Swift Heavy Ion Irradiation (SHII) induced cation rearrangement has been revealed through the comparative Mössbauer signatures of both the systems. The hyperfine interaction parameters deduced through Mössbauer spectra are also discussed before and after irradiation. The observed reduction in the saturation magnetic moment and Curie temperature after irradiation supports the partial formation of paramagnetic centres and rearrangement of cations in the lattice.

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