Improved magnetic properties of Sr 0.93 Sm 0.10 Fe 11.97 O 19 /Fe 3 O 4 composite powders by substitution of Sm and magn
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Improved magnetic properties of Sr0.93Sm0.10Fe11.97O19/ Fe3O4 composite powders by substitution of Sm and magnetic exchange coupling effect Juli Liang1, Xuehang Wu1,*, Wenwei Wu1,2,* Yizhong Huang3
, Lili Chen1, Yifan Huang3, and
1
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, People’s Republic of China Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People’s Republic of China 3 Guangxi Zhuang Autonomous Region Center for Analysis and Test Research, Nanning 530022, People’s Republic of China 2
Received: 17 July 2020
ABSTRACT
Accepted: 28 September 2020
M-type hexagonal Sr0.93SmxFe12.07-xO19 and Sr0.93Sm0.1Fe11.97O19/Fe3O4 (SSFO/ Fe3O4) composites are prepared by the ball-milling-assisted ceramic process and the solvothermal method, respectively. Substitution of Fe3? ions by Sm3? ions can significantly enhance the specific saturation magnetization (Ms), remanence (Mr), and coercivity (Hc) of Sr0.93SmxFe12.07-xO19. Increase in coercivity is attributed to an increase in the magnetrocrystalline anisotropy and a reduction in the particle size after substitution of Fe3? ions by Sm3? ions. Sr0.93Sm0.10Fe11.97O19 has the highest specific saturation magnetization value (71.16 emu/g). By contrast, 2.91% increase in specific saturation magnetization and 22.86% increase in coercivity for SSFO/Fe3O4 composite with 4:1 mass ratio of hard to soft ferrites are observed, respectively, as compared to the pure SSFO. Besides, SSFO/Fe3O4 composite with 4:1 mass ratio of hard to soft ferrites behaves higher Mr (33.80 emu/g) and Hc (2624.27 Oe) values than theoretically calculated values of 30.60 emu/g and 1722.72 Oe, indicating the presence of strong exchange coupling interaction between the hard SSFO and soft Fe3O4 phases.
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Springer Science+Business
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1 Introduction Rare-earth metal alloys, such as Nd–Ce–Fe–B [1], Sm–Co–Fe [2], and Nd–Fe–B [3], are well-known permanent magnets, which have been widely used in many fields, including the wind power generators and newly-developing hybrid electric vehicles
(HEVs) due to their high energy product ((BH)max). However, these rare-earth metal alloy permanent magnets have several shortcomings, such as low Curie temperature (Tc), high cost, poor oxidation and corrosion resistivity [4]. The large-scale promotion of the use of rare-earth metal alloys exerts a tremendous pressure on the increase of cost. Hexagonal ferrite is
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https://doi.org/10.1007/s10854-020-04559-1
J Mater Sci: Mater Electron
an attractive alternative to rare-earth metal alloys given the relatively high Curie temperature, good oxidation resistance, and inexpensive cost in addition to excellent magnetic properties [5–8]. In hexagonal ferrites, M-type SrFe12O19 (SFO) and its doped SrFe12O19 have been paid great attention by researchers due to their excellent magnetic properties
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