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Effect of iron doping at Mn-site on complex impedance spectroscopy properties of Nd0.67Ba0.33MnO3 perovskite |
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| Authors: | Mohamed Hsini Nejeh Hamdaoui Sobhi Hcini Mohamed Lamjed Bouazizi Sadok Zemni Lotfi Beji |
| Institution: | 1. Laboratory of Physical Chemistry of Materials, Faculty of Science of Monastir, Department of Physics, University of Monastir, Monastir, Tunisia;2. Laboratory of Energy and Materials, High School of Sciences and Technologies of Hammam Sousse, Department of Physics, University of Sousse, Hammam Sousse, Tunisia;3. Laboratory of Energy and Materials, Research Group of Nano-Materials for Telecommunications, Higher Institute of Computer and Communication Technologies, University of Sousse, Hammam Sousse, Tunisia;4. Research Unit of Valorization and Optimization of Exploitation of Resources, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, Sidi Bouzid, Tunisia;5. Mechanical Department, College of Engineering, Prince Sattam Bin Abdulaziz University, Al Kharj, Saudi Arabia |
| Abstract: | The effect of Fe-doping at Mn-site on the structural and electrical properties of Nd0.67Ba0.33Mn1?xFexO3 (0 ≤ x ≤ 0.05) perovskites has been investigated. X-ray diffraction patterns show that the structural parameters change slightly due to the fact that the Fe3+ ions replacing the Mn3+ have similar ionic radius. The electrical properties of these samples have been investigated using complex impedance spectroscopy technique. a function of the frequency at different temperatures. When increasing the Fe-content, a decrease of dc conductivity was observed throughout the whole explored temperature range and the deduced activation energy values are found to increase from 128 meV for x = 0 to 166 meV for x = 0.05. The curves of the imaginary part of impedance (Z″) show the presence of relaxation phenomenon in our samples. The complex impedance spectra show semicircle arcs at different temperatures and an equivalent circuit of the type of Rg + (Rgb//Cgb) has been proposed to explain the impedance results. |
| Keywords: | Perovskites complex impedance spectroscopy conductivity relaxation time |