Structural and complex impedance spectroscopic studies of Mg-substituted CoFe2O4 |
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| Affiliation: | 1. Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam campus, Lahore 54590, Pakistan;2. Department of Physics and Astronomy, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia;1. Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Bd. Carol I, nr. 11, 700506 Iasi, Romania;2. National Institute of Material Physics, P.O. Box MG-7, 07125 Bucharest, Romania;1. Department of Physics, National Institute of Technology, Rourkela, 769 008, India;2. Department of Ceramic Engineering, National Institute of Technology, Rourkela, 769 008, India;3. Variable Energy Cyclotron Centre, Kolkata, 700064, India;1. Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan;2. Department of Physics, COMSATS Institute of Information Technology, Lahore, 54000, Pakistan;3. Karachi Institute of Power Engineering (KINPOE), Affiliated with Pakistan Institute of Engineering and Applied, Science (PIEAS), Islamabad, Pakistan;1. Department of Physics, National Institute of Technology, Hamirpur, H.P 177 005, India;2. Centre for Material Science and Engineering, National Institute of Technology, Hamirpur, H.P 177 005, India;1. Department of Physics, National Institute of Technology, Hamirpur Himachal Pradesh, 177005, India;2. National Physical Laboratory, New Delhi 110012, India;3. Centre for Material Science and Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh 177005, India |
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| Abstract: | In this work, we present the effect of Mg substitution on the structural and impedance spectroscopic characteristics of Co1?xMgxFe2O4 (x=0.0, 0.3, 0.6, 0.9 and 1.0) samples, prepared by sol-gel auto-combustion method. As-burnt and fluffy powder samples were grinded and subsequently calcined at 600 °C for 6 h to change single phase cubic spinel structure, as confirmed by X-ray diffraction. The data obtained from diffraction was also utilized to perform Rietveld's refinement which provided detailed information on the structural changes occurred during the substitution. Frequency and temperature dependent electrical, and impedance studies were performed using an impedance analyzer in a wide frequency and temperature range. The behavior of characteristic dielectric parameters has been investigated using Maxwell-Wagner's model and Koop's theory. The impedance plot was used to define electro-active regions of the prepared samples, useful in modelling an equivalent circuit for each region. Frequency dependent Nyquist plot revealed the effect of grain, grain boundaries and electrode effect. Samples exhibited distinct grain and grain boundary contributions to the conductivity. Temperature dependent electrical characterization revealed that samples had negative temperature coefficient of resistance. The binding energies at different temperatures have also been estimated. |
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| Keywords: | Structural properties Impedance spectroscopy |
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