ABSTRACT In this study, lithium and magnesium ferrites have been synthesized using EDTA/EG assisted sol-gel method. Based on X-ray diffraction data, it is identified that a spinel-type structure of Li ferrite with space group of P4332 and Mg ferrite with space group of Fd3m has been successfully formed. The estimated value of crystallite size falls within 33-42 nm range. The microstructure of the as-produced powders examined by a field emission scanning electron microscope shows that secondary particles with the mean particle size of 30-170 nm tend to agglomerate severely. Regarding the magnetic properties measured by a vibrating sample magnetometer, Li ferrite, due to higher saturation magnetization than that of Mg ferrite (53.54 versus 23.27 emu.g–1) exhibits superior magnetic properties. In contrast, dielectric properties shows that Mg ferrite gives a much greater dielectric constant at all the measured frequency range. GRAPHICAL ABSTRACT

中文翻译：

---

通过 EDTA/EG 辅助溶胶-凝胶法合成的纳米晶（M = Li 和 Mg）铁氧体的结构、磁性和介电特性

摘要 在本研究中，使用 EDTA/EG 辅助溶胶-凝胶法合成了锂和镁铁氧体。基于X射线衍射数据，确定成功地形成了空间群为P4332的锂铁氧体和空间群为Fd3m的镁铁氧体的尖晶石型结构。微晶尺寸的估计值落在 33-42 nm 范围内。通过场发射扫描电子显微镜检查所制备粉末的微观结构表明，平均粒径为 30-170 nm 的二次颗粒趋于严重团聚。关于由振动样品磁强计测量的磁性能，由于比镁铁氧体（53.54 对 23.27 emu.g-1）更高的饱和磁化强度，锂铁氧体表现出优异的磁性能。相比之下，介电特性表明，镁铁氧体在所有测量频率范围内都具有更大的介电常数。图形概要