J. Phys. III France
Volume 6, Numéro 10, October 1996
Page(s) 1307 - 1313
DOI: 10.1051/jp3:1996188
J. Phys. III France 6 (1996) 1307-1313

Electrical and Dielectric Properties of Ni $_{\rm x}$Mg $_{1-{\rm x}}$Fe 2O 4

M.A. El Hiti

Physics Department, Faculty of Science, Tanta University, Tanta, Egypt

(Received 21 December 1995, revised 9 April 1996, accepted 27 June 1996)

The electrical conductivity and dielectric behavior were studied at room temperature for Ni xMg 1-xFe 2O 4 samples prepared by usual ceramic technique. The experimental results indicated that the real dielectric constant $\varepsilon^{\prime}$ and loss factor tan $\delta$ decrease while the AC electrical conductivity $\sigma_{2}(\omega)$ increases as the frequency increases. The DC and AC electrical conductivity, $\varepsilon^{\prime}$ and tan $\delta$ decrease as Ni-ion substitution increases. The parameters n and B for the AC electrical conductivity $\sigma_{2}(\omega)$ were found to be composition dependent, n and B decrease as Ni-ion substitution increases. Empirical formulae were suggested for the compositional dependence of both n and B respectively.

© Les Editions de Physique 1996