Jeidd Abddaim, Amghar Mohamed, Mabrouki A, Benali A, Trabelsi A, Dhahri E, Khirouni K, Costa B F O
Applied Physics Laboratory, Faculty of Sciences of Sfax, University of Sfax 3000 Sfax Tunisia
Physics Department, CFisUC, University of Coimbra Rua Larga P-3004-516 Coimbra Portugal.
RSC Adv. 2023 Apr 26;13(19):12906-12916. doi: 10.1039/d2ra07970d. eCollection 2023 Apr 24.
In the present research study, the structural, optical, magnetic, electrical and dielectrical properties of the spinel ferrite LiMgFeO, synthesized using a sol-gel auto-combustion method were studied. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy revealed that this sample crystallizes in a cubic spinel structure with space group 3̄. Moreover, the optical investigation by UV-visible spectroscopy has revealed that the band gap for our sample is ( = 2.87 eV), which shows that our compound is a potential candidate for optoelectronic applications. The values of the remanent magnetization = 0.13 emu g, of the coercive field = 4.65 Oe deduced from the hysteresis loop, are very low, suggesting the superparamagnetic behavior of our sample. Additionally, the temperature coefficient of resistance (TCR) is -19% affirmed that LiMgFeO ferrite is a good candidate for detecting infrared radiation and infrared bolometric applications. Indeed, the activation energies were calculated from the imaginary part of the impedance, the electrical conductivity, and the imaginary part of the modulus, thus demonstrating that the charge carriers involved in the processes of conduction and relaxation are the same.
在本研究中，对采用溶胶 - 凝胶自燃烧法合成的尖晶石铁氧体LiMgFeO的结构、光学、磁性、电学和介电性能进行了研究。X射线衍射、傅里叶变换红外光谱（FTIR）和拉曼光谱表明，该样品结晶为具有空间群3̄的立方尖晶石结构。此外，通过紫外 - 可见光谱进行的光学研究表明，我们样品的带隙为（= 2.87 eV），这表明我们的化合物是光电子应用的潜在候选材料。从磁滞回线推导出的剩余磁化强度= 0.13 emu g、矫顽场= 4.65 Oe的值非常低，表明我们样品具有超顺磁行为。此外，电阻温度系数（TCR）为 -19%，证实LiMgFeO铁氧体是检测红外辐射和红外测辐射热应用的良好候选材料。实际上，从阻抗的虚部、电导率和模量的虚部计算出了活化能，从而证明参与传导和弛豫过程的电荷载流子是相同的。
