|
|||||
|
|
Synthesis,structural and complex impedance spectroscopy studies of Ni0.4Co0.4Mg0.2Fe2O4 spinel ferrite |
|
| Authors: | Ahmed Selmi Sobhi Hcini Hedi Rahmouni Aref Omri Mohamed Lamjed Bouazizi Abdessalem Dhahri |
| Institution: | 1. Department of Chemistry, Faculty of Sciences of Gafsa, University Campus - Sidi Ahmed Zarroug, University of Gafsa, Gafsa, Tunisia;2. Research unit of valorization and optimization of exploitation of resources, Faculty of Science and Technology of Sidi Bouzid, University Campus Agricultural City, University of Kairouan, Sidi Bouzid, Tunisia;3. Research unit of advanced materials and nanotechnology (URMAN), Higher Institute of Applied Science and Technology of Kasserine, University of Kairouan, Kasserine, Tunisia;4. Laboratory of Physics of Materials and Nanomaterials applied to the Environment, Faculty of Sciences, University of Gabes, Erriadh City, Gabes, Tunisia;5. Mechanical Department, College of Engineering, Prince Sattam Bin Abdulaziz University, Al Kharj, Kingdom of Saudi Arabia;6. Department of Physics, Faculty of Science of Monastir, Laboratory of Physical Chemistry of Materials, University of Monastir, Monastir, Tunisia |
| Abstract: | Spinel ferrite having composition Ni0.4Co0.4Mg0.2Fe2O4 was prepared by sol-gel method. X-ray diffraction result indicates that the ferrite sample has a cubic spinel type structure. FT-IR showed two absorption bands (ν1 and ν2) that are attributed to the stretching vibration of tetrahedral and octahedral sites. Complex impedance properties have been investigated in 200–420 K temperature range with varying frequency between 40 and 107 Hz. Frequency and temperature dependency of imaginary part of permittivity (?″) and dielectric loss (tanδ) has been discussed in terms of hopping of charge carriers between Fe2+ and Fe3+ ions. Activation energy has been estimated from both temperature dependency of dc conductivity and relaxation time data, which indicates that the relaxation process and conductivity have the same origin. Nyquist plots of impedance show semicircle arcs for sample and an electrical equivalent circuit has been proposed to explain the impedance results. |
| Keywords: | Ferrite nanoparticle sol–gel method dielectric properties complex impedance spectroscopy |