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Title: Modulation of magnetism and study of impedance and alternating current conductivity of Zn0.4Ni0.6Fe2O4 spinel ferrite
Author: Amor, S.B.
Benali, A.
Bejar, M.
Dhahri, E.
Khirouni, K.
Valente, M.A.
Graça, M.P.F.
Al-Turjman, F.
Rodriguez, J.
Radwan, A.
Keywords: Spinel
Solid state
Conduction mechanism
Issue Date: 15-May-2019
Publisher: Elsevier
Abstract: A spinel ferrite sample Zn0.4Ni0.6Fe2O4 was prepared by a conventional solid-state reaction method at high temperature. This compound was found to exhibit a single phase and crystallize in a cubic structure with Pm3 m Space group. The complex impedance was investigated in the temperature range 400–700 K and in the frequency range 100 Hz - 1 MHz. The Z-impedance analysis revealed that the relaxation phenomenon is strongly dependent on temperature and frequency. The impedance plane plot showed semi-circle arcs at different temperatures, and a proposed electrical equivalent circuit explained its results. The temperature and frequency dependence of the ac conductivity was shown to obey the universal Jonscher's power law. The activation energy, inferred from the impedance spectrum, was confirmed to match very well with those estimated from the conduction mechanism, indicating that the relaxation process and conductivity have the same origin. The magnetization is due to the ferromagnetic interactions between iron ions.
Peer review: yes
DOI: 10.1016/j.molstruc.2019.02.053
ISSN: 0022-2860
Appears in Collections:DFis - Artigos
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