J. Phys. IV France 07 (1997) C1-227-C1-228
Interfacial Dielectric Losses in Co-Doped Ni-Zn FerritesG. Nicoara1, M. Steflea2 and M. Toacsan1
1 Institute of Physics and Technology of Materials, P.O. Box MG-7, 76900 Bucharest-Magurele, Romania
2 Bucharest University, Physics Department, 76900 Bucharest-Magurele, Romania
The temperature and frequency dependence of tg δ and ε' for Ni0.8Zn0.2CoxFe2-x ferrites was studied in the 102-106 Hz frequency range and 20-200°C temperature range. The experimental curves exhibit aspects very dependent of composition. To verify that interfacial losses, expected to appear in this type of system, are compatible with the experimental results a calculation of the dielectric permittivity and dielectric loss using the Koops' model was made. A good correlation between calculated and experimental curves was found.
© EDP Sciences 1997