LI-ZN FERRITES WITH NONMAGNETIC ADDITIVES

The authors investigated the effect of small additive amounts of non-m agnetic ions as Na1+, Ca2+, Zr2+, Sb3+ and binary or ternary combinati ons of these ions on some physical properties of the (Li0.5Fe0.5)0.6Zn 0.4Fe2O4 ferrite used in high frequency. It was found that by the segr egation of these additives on the grain boundaries, the grain growth i s diminished and much higher sintered densities are obtained in severa l cases, though not all. We established that additives such as Na2O, C aO, ZrO2 enhance the rate of sintering, giving a speedy start to the s intering process. All additives improve the electrical resistivity due to insulating intergranular layers generated by segregation of additi ves.