J. Phys. III France
Volume 5, Numéro 6, June 1995
Page(s) 775 - 781
DOI: 10.1051/jp3:1995103
J. Phys. III France 5 (1995) 775-781

Electrical and Dielectric Properties of Zn $_\mathsf{0.8}$Co $_\mathsf{0.2}$Fe $_\mathsf{2}$O $_\mathsf{4}$

M.A. Ahmed and M.A. El Hiti

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

(Received 15 November 1994, revised 10 February 1995, accepted 15 March 1995)

DC, AC electrical resistivity ( $\rho_{\rm dc}$ and $\rho_{\rm ac}$ ( $\omega$) and dielectric properties ( $\varepsilon'$ and $\tan \delta$) were studied for Zn 0.8Co 0.2Fe 2O 4 ferrite samples prepared at sintering temperatures ( $T_{\rm s}$) in the range 1273 to 1473 K by the usual ceramic technique. The experimental results indicated that the DC and AC electrical resistivity, Curie temperature ( $T_{\rm c}$) and activation energies for electrical conduction ( $E_{\rm p}$ and $E_{\rm f}$) decrease as the sintering temperature increases. The DC electrical conductivity increases as the temperature increases. It was found that $\varepsilon'$, $\tan \delta$ and $\rho'_{\rm ac}$ ( $\omega$) decrease as frequency increases.

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