Abstract
Mn-Zn ferrites doped with different Sm2O3, Gd2O3, Ce2O3 or Y2O3 were prepared by traditional ceramic technology using industrial pre-sintered powders. A small amount of Sm2O3, Gd2O3, Ce2O3 or Y2O3 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 Sm2O3 or Gd2O3 is 0.01 wt.%, while for Ce2O3 or Y2O3 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.% Sm2O3 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.
Highlights
As a typical soft magnetic material, Mn-Zn ferrites exhibit high performance-cost ratio and excellent soft magnetic properties, which make it widely used in home appliances, communication, computer and other electronic industries.[1,2] With the rapid development of industry, advanced properties of Mn–Zn ferrites such as high permeability and low loss are required in response to the progress of electronic equipment towards miniaturization, light-weight and multifunction.[3]
The magnetic properties including amplitude permeability, loss and coercivity were tested by soft magnetic measuring device (MATS-2010SA, Hunan Linkjoin Technology Co.) at 200 mT and 100 kHz for the Mn-Zn ferrites doped by Sm2O3 or Gd2O3, while at 100 mT and 100 kHz for the samples doped by Ce2O3 or Y2O3
The XRD patterns of the Mn-Zn ferrites doped with different Gd2O3, Sm2O3, Ce2O3 or Y2O3 are shown in Fig. 1(a)–(d), respectively
Summary
As a typical soft magnetic material, Mn-Zn ferrites exhibit high performance-cost ratio and excellent soft magnetic properties, which make it widely used in home appliances, communication, computer and other electronic industries.[1,2] With the rapid development of industry, advanced properties of Mn–Zn ferrites such as high permeability and low loss are required in response to the progress of electronic equipment towards miniaturization, light-weight and multifunction.[3]. 8 A-site and 16 B-site were occupied by metal cations, leading to 72 vacancies in the unit cell This kind of crystal structure allows the introduction of different metallic ions including the rare earth ions into the lattice, modifying the structure and magnetic properties.[4,5]. We use industrial pre-sintered powders as the raw materials, and prepare Mn-Zn ferrites with different Sm2O3, Gd2O3, Ce2O3 or Y2O3 doping concentrations by traditional ceramic technology. The effects of these individual rare earth ion doping on the structure and magnetic properties of Mn-Zn ferrite have been studied
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