Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11026358 | Journal of Magnetism and Magnetic Materials | 2019 | 23 Pages |
Abstract
Effect of swift heavy ion irradiation on MgFe2O4 (annealed at 450â¯Â°C/3â¯h) sample prepared by a sol-gel auto-combustion procedure has been studied. Single phase samples were irradiated with 120â¯MeV 28Si9+ with ion fluence: 1â¯Ãâ¯1011, 1â¯Ãâ¯1012, and 1â¯Ãâ¯1013 ions/cm2 to monitor its effect on the structure, cation distribution, and magnetic properties. Electronic energy loss induced modifications of cation distribution, structural, magnetic properties were examined by XRD, VSM, FE-SEM, and EDS. XRD measurements show the formation of single phase nanocrystalline mixed cubic spinel structure (grain size 31-35â¯nm). Observed slight changes of experimental lattice parameter with increasing irradiation dose is ascribable to the migration of Mg2+ ions (ionic radius: 0.071â¯nm) from B to A site with simultaneous migration of Fe3+ ions (ionic radius: 0.063â¯nm) from A to B site. Sample irradiated at a lower fluence (1â¯Ãâ¯1011 ions/cm2) has higher specific surface area (S), is more suitable for catalytic activity. Irradiation leads formation of dead layer, thus affects magnetic properties, via spin canting at surface. Therefore, irradiation can be used to control both structural, magnetic properties. SEM images display agglomerated nano-particles, while EDS pattern confirms the presence of Mg, Fe and O elements in the sample. First time the antistructural modeling for magnesium ferrite is reported to get information on active surface centers.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
S. Raghuvanshi, P. Tiwari, S.N. Kane, D.K. Avasthi, F. Mazaleyrat, Tetiana Tatarchuk, Ivan Mironyuk,