Modifying the Soft Magnetic Properties of Mn-Zn Ferrites by Ce 2 O 3 -Doping and Sintering Temperature Optimization
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https://doi.org/10.1007/s11664-020-08414-1 2020 The Minerals, Metals & Materials Society
Modifying the Soft Magnetic Properties of Mn-Zn Ferrites by Ce2O3-Doping and Sintering Temperature Optimization JINGWEN HU,1 ZHAOYU LI,1 HONGYA YU,1,2 XICHUN ZHONG,1,2 ZHONGWU LIU ,1,2,4 KEWEN LONG,2 and JING LI3,5 1.—School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China. 2.—Sanqiaohui (Foshan) New Materials Co., Ltd, Foshan 528200, China. 3.—School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]
Abundant rare earth-based Ce2O3 was employed as the doping for improving the magnetic performance of low-cost Mn-Zn ferrites. To achieve the best doping effect, the influence of sintering temperature on the microstructure and magnetic properties was also investigated. Based on the characterization of the samples prepared at different sintering temperatures (1250–1350C) and with various Ce2O3 contents (0–0.05 wt.%), it has been found that the magnetic properties are determined by the grain size, the distribution of the pores, and the internal stress associated with impurities. The amplitude permeability for the samples with small grains shows good frequency stability in the range of 10–100 kHz. Increasing the sintering temperature or doping a certain amount of Ce2O3 can increase the amplitude permeability and reduce the magnetic loss of the ferrite. However, excessive Ce addition or excessive sintering temperature led to increasing magnetic loss. For the sample doped with 0.01 wt.% Ce2O3, the maximum amplitude permeabilities of 4105 (20 kHz and 100 mT) and 2830 (100 kHz, 100 mT) can be obtained when sintered at 1350C, while the minimum power loss with 5.4 W/kg (20 kHz, 100 mT) and 46 W/kg (100 kHz, 100 mT) can be achieved at a sintering temperature of 1280C. The present results indicate that Ce doping cannot only effectively increase the amplitude permeability and decrease the magnetic loss but can also reduce the sintering temperature. The produced ferrites show great potential for the applications in induction heating systems and other fields. Key words: Mn-Zn ferrites, Ce2O3-doping, sintering temperature, magnetic properties, microstructure
INTRODUCTION The well-known Mn-Zn ferrites exhibit good soft magnetic properties with high electric resistivity, high saturation magnetization, low loss, and high permeability. They are widely used in various lowand high-frequency devices such as transformers, multilayered chip inductors, sensors, information
(Received March 25, 2020; accepted August 13, 2020)
storage systems, information communications, and magnetic diagnostics.1–4 With the rapid development of the electric and electronic industries, MnZn ferrites with further improved properties, such as higher permeability and lower loss, are still required in response to the miniaturization, light weight, and multifunction of electronic devices.5 For example, Mn-Zn ferri
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