Effect of Er2O3 addition on microstructure and physical properties of Mn-Zn ferrites for high-power use

[[abstract]]The present authors found that Mn-Zn ferrites containing Er2O3 had improved values of σs (specific magnetization) and amplitude permeability. Samples with different addition amount of Er2O3 were sintered at 1180°C. The results show that Er2O3 addition from 0.02 to 0.1 wt.% causes the amplitude permeability to increase from 1070 to 2180. The magnetization can be increased from 91.6 to 92.8 emu/g within the range 0.02-0.1 wt.%. Furthermore, the effect of Er2O3 addition was investigated in detail by power-loss analysis and scanning electron microscopy examination of microstructure. We found that samples with Er2O3 less than 0.04 wt.% exhibit power loss similar to the sample without Er2O3 addition and with SiO2-CaO contents. Thus we conclude that the amplitude permeability and specific magnetization of Mn-Zn ferrites for high-frequency and high-power use were improved by a small Er2O3 addition (