Abstract
The dielectric constant (
ε′) and dielectric loss factor (
ε″) for the ferrite Co
1−
x
Zn
x
La
y
Fe
2−
y
O
4; 0.1≤
x≤1.0 were measured at different frequencies (100
kHz to 5
MHz) and different temperatures (300–850
K). More than one type of polarization participates in the dielectric process, Maxwell Wagner polarization is the one participating in the high temperature region. The electrical conductivity measurement showed that there is more than one conduction mechanism participating in conductivity. The hopping mechanism either by holes or electrons or both is the predominant one. The increase in conductivity is due to the thermally activated mobility and not to thermal creation of additional mobile charge carriers. The replacement of Fe
3+ by La on octahedral sites and the presence of Co
2+ as well as Zn
2+ ions on the tetrahedral sites play a significant role in the electrical and magnetic properties behavior of the investigates samples. The values of the activation energy obtained indicate the semi-conducting behavior of the investigated ferrite.