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Effect of sintering temperature and the particle size on the structural and magnetic properties of nanocrystalline Li0.5Fe2.5O4 |
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| Authors: | Sagar E Shirsath RH KadamAnil S Gaikwad Ali GhasemiAkimitsu Morisako |
| Institution: | a Department of Physics, Vivekanand College, Aurangabad 431004 (MS), India b Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004 (MS), India c Materials Science Research Laboratory, Shrikrishna Mahavidyalaya Gunjoti, Osmanabad (MS), India d Materials Engineering Department, Malek Ashtar University of Technology, Shahin Shahr, Iran e Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano, Japan |
| Abstract: | Sintering temperature and particle size dependent structural and magnetic properties of lithium ferrite (Li0.5Fe2.5O4) were synthesized and sintered at four different temperatures ranging from 875 to 1475 K in the step of 200 K. The sample sintered at 875 K was also treated for four different sintering times ranging from 4 to 16 h. Samples sintered at 1475 K have the cubic spinel structure with a small amount of α-Fe2O3 (hematite) and γ-Fe2O3 (maghemite). The samples sintered at≤1275 K do not show hematite and maghemite phases and the crystals form the single phase spinel structure with the cation ordering on octahedral sites. Particle size of lithium ferrite is in the range of 13-45 nm, and is depend on the sintering temperature and sintering time. The saturation magnetization increased from 45 to 76 emu/g and coercivity decreases from 151 to 139 Oe with an increase in particle size. Magnetization temperature curve recorded in ZFC and FC modes in an external magnetic field of 100 Oe. Typical blocking effects are observed below about 244 K. The dielectric constant increases with an increase in sintering temperature and particle size. |
| Keywords: | Li0 5Fe2 5O4 Particle size Sintering temperature Magnetization Blocking temperature |
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