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| Effects of Ca content on the Ca-La-Co co-substituted M-type Sr-hexaferrites |
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Received:May 05, 2022
Revised:May 12, 2022
Accepted:May 13, 2022
Published Online:July 04, 2022
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| DOI： |
| KeyWord:m-type strontium ferrite;ions substituted;magnetic properties |
| Author | Institution |
| weiahanzhong |
BGRIMM Technology Group Co. Ltd |
| sunwei |
BGRIMM Technology Group Co. Ltd |
| caoyujie |
BGRIMM Technology Group Co. Ltd |
| zhangpengjie |
BGRIMM Technology Group Co. Ltd |
| wangjiquan |
BGRIMM Technology Group Co. Ltd |
| quanxiaokang |
BGRIMM Technology Group Co. Ltd |
| liuhui |
BGRIMM Technology Group Co. Ltd |
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| Abstract: |
| In this paper, the M-type strontium ferrite magnet is prepared by the conventional solid-state ball-milling method, and the effects of Ca content on the Ca-La-Co co-substituted M-type Sr-hexaferrites are investigated. The phase identification, unit cell structure, microscopic morphology and magnetic properties were characterized by X-ray diffraction, field emission scanning electron microscopy and hysteresis curve measuring instrument. The partial substitution of Sr2+ by Ca2+ will shrink the c-axis of the unit cell. When the Ca content is less than 0.2 at%, a single magnetoplumbite phase is obtained while the α-Fe2O3 phase occurs as the Ca content beyond 0.3 at%. The Ca2+ and SrO can form a low-melting eutectic, which accelerates the grain growth in the c-axis direction and promotes the formation of hexagonal flake structures. The particle size is about 1.0 μm at 0.2 at% Ca content and presents uniform size distribution, then abnormal grain growth appeares with the further increasing Ca content. The increase of Ca content will increase the coercivity, but reduce the saturation magnetization and remanence of the magnet, at 0.2 at% Ca content, the coercive force increases sharply with only slightly decrease in remanence. |
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