Bulg. J. Phys. vol.45 no.1 (2018), pp. 044-053



AC Conductivity and Dielectric Properties of Mn-Zn Ferrites

A.A. Arais1, K.E. Rady2, M.S. Shams1
1Physics and Mathematical Engineering Department, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt
2Engineering Basic Sciences Department, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
Abstract. The effect of Zn+2 ions on the AC conductivity and dielectric properties of Mn1-xZnxFe2O4 (x = 0.0 0.1, 0.2, 0.3, 0.4, and 0.5) nanoferrites prepared by solid state reaction method in the frequency range of 100 kHz – 5 MHz at temperatures between 300 K and 610 K. AC conductivity (σac) and dielectric constant (ε') measurements showed that all samples have semiconducting behavior and were increased with increasing temperature and frequency. The variation of the dielectric loss factor (ε'') with temperature and frequency showed two distinct regions, the first one from 300 K to 350 K which was frequency and temperature independent and the second region from 350 K to 610 K was frequency and temperature dependent. The AC conductivity and dielectric properties have been explained on the basis of space charge polarization according to Maxwell-Wagner and correlated barrier hopping (CBH) models. The electron hopping between Fe+2 and Fe+3 ions as well as hole hopping between Mn+2 and Mn+3 ions. The sample with Zn content (x = 0.1) has low AC conductivity but has the highest dielectric constant and dielectric loss factor values.

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