Improving soft magnetic properties of Mn-Zn ferrite by rare earth ions doping

Abstract

Mn-Zn ferrites doped with different Sm 2 O 3 , Gd 2 O 3 , Ce 2 O 3 or Y 2 O 3 were prepared by traditional ceramic technology using industrial pre-sintered powders. A small amount of Sm 2 O 3 , Gd 2 O 3 , Ce 2 O 3 or Y 2 O 3 can significantly improve the microstructure and magnetic properties. The single spinel phase structure can be maintained with the doping amount up to 0.07 wt.%. A refined grain structure and uniform grain size distribution can be obtained by doping. For all rare earth oxides, a small amount of doping can significantly increase the permeability and reduce the coercivity and magnetic core loss. The optimized doping amount for Sm 2 O 3 or Gd 2 O 3 is 0.01 wt.%, while for Ce 2 O 3 or Y 2 O 3 is 0.03 wt.%. A further increase of the doping content will lead to reduced soft magnetic properties. The ferrite sample with 0.01 wt.% Sm 2 O 3 exhibits the good magnetic properties with permeability, loss, and coercivity of 2586, 316 W/kg, and 24A/m, respectively, at 200 mT and 100 kHz. The present results indicate that rare earth doping can be suggested to be one of the effective ways to improve the performance of soft ferrites.

Modifying the Soft Magnetic Properties of Mn-Zn Ferrites by Ce2O3-Doping and Sintering Temperature Optimization

“…In addition to the composition and process, additives have important influences on the performance of Mn-Zn ferrites. 6 Hence, element doping is an important way to modify their electromagnetic properties.…”

“…Recently, rare earth (RE) elements have received much attention from ferrite industries. 6,7 Different kinds of RE elements, such as gadolinium (Gd), 8 dysprosium (Dy), 9,10 neodymium (Nd), 11 samarium (Sm), [12][13][14][15][16] lanthanum (La), 17 terbium (Tb), 10,18,19 cerium (Ce), 18,[20][21][22] etc., have been introduced into different types of ferrites. The obtained results reveal that, by introducing a small amount of RE 2 O 3 to substitute Fe 2 O 3 , modifications of both the structure and the magnetic properties can be obtained.…”

Electrical, Dielectric and Magnetic Properties of Mg2+ Doped Zn-Co-La Spinel Ferrites for High Microwave Frequency (5.7-13.4 GHz) Applications

“…Such characteristics may be improved with the addition of rare earth metals. Researchers have examined effects on structures and magnetic outcomes by accumulation of Sm, Gd, La, Ce and Y [10][11][12]. For different electrical and microwave properties lanthanum doped spinel ferrites have gained attention of researchers [12].…”

Graphene oxide-ferrite hybrid framework as enhanced broadband absorption in gigahertz frequencies

“…To date, a wide range of soft magnetic materials has been developed for microwave absorption purpose. To name a few, Co-ferrite 8 , Ni-ferrite, NiZn-ferrite 9 , MnZn-ferrite 10 , MgZn-ferrite 9,11 and other substituted soft ferrites 12 . Nanocrystalline spinel ferrites exhibit significant changes in the cationic distribution; thus, resulting in improved magnetic properties as compared to their bulk counterpart.…”