Improvement of electric and magnetic properties for Li spinel ferrite by divalent Zn2+ ions substitution

Abstract

Abstract In the present work magnetic, electric and dielectric properties are investigated for mixed ferrite Li0.5(1-x)ZnxFe2.5-0.5xO4 ( where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1) which are prepared from high purity oxides using standard ceramic technique. The magnetization (M) is measured at room temperature in the range of the applied field from 148 A.m-1 up to 1856 A.m-1. The results indicated that the magnetization increased as increasing Zn2+ ions for samples of (x ≤ 0.6) while samples of (x ≥ 0.8) were considered to be paramagnetic at room temperature which have no magnetization . DC conductivity () is measured as a function of temperature, the relation between with temperature indicates that the conductivity increases with increasing the temperature which prove that the samples has a semiconductor behavior. Also the relation between and temperature show a change in the slope which is attributed to the change of samples from ferrimagnetic to paramagnetic, Curie point, (). To determine, the inductance was measured as a function of temperature. The inductance increased until, then decreased sharply. is found to decrease with increasing the Zn2+ ions. Dielectric constant (), dielectric loss tangent () and AC conductivity () have been investigated in the frequency range of at room temperature. It is found that the value of decreases continuously with increasing the frequency, while increases with increasing frequency until certain point then it seems to be constant with change of frequency. Experimental results of show maxima points at certain frequency and these maxima found to be shifted to lower frequency.