Structural and Magnetic Properties of Nanocrystalline Lithium–Zinc Ferrite Synthesized by Microwave-Induced Glycine–Nitrate Process
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In this study, nanocrystalline Li–Zn ferrites with the chemical composition Li0.5Zn x Fe2.5−x O4 (where x=0, 0.1,0.2,0.3,0.4,0.5) were synthesized by the glycine–nitrate process using glycine as a fuel, nitrate as an oxidizer and microwave oven as a heat source. The combustion reaction was studied by differential thermal analysis and thermogravimetry. The experimentally determined combustion reaction is extremely exothermic and it occurs at 170 ∘C. The as-synthesized powders were characterized by X-ray diffraction technique. X-ray diffraction data shows that nanocrystalline Li–Zn ferrite powders with a spinel structure have been formed successfully in all samples. Morphological studies using scanning electron microscopy and field emission scanning electron microscopy show agglomerated clusters with a lot of pores attributed to the large amount of gases released during the combustion synthesis with the particle size of 20–40 nm. The magnetic measurements on the as-synthesized powders and compacted samples were carried out using a vibrating sample magnetometer and an inductance/capacitance/resistance meter, respectively. Saturation magnetization increases with the increase in zinc concentration up to x=0.2 and then it decreases with the increase in the zinc content. In addition, maximum magnetic permeability also obtained for the sample with x=0.2 at different frequencies.
KeywordsLi–Zn ferrite Glycine–nitrate process Nanocrystalline Saturation magnetization Permeability Loss factor
The authors would like to thank the Shahid Chamran University for providing support to this research through the Grant 91-4-06-636410. The authors are indebted to Dr. Ranjbar, Dr. Saemi and S. Tahanzadeh for their great assistance. We also would like to thank H. Mohseni and S. Hajarpour who gave us excellent advices.
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