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Improvement of coercivity thermal stability of sintered 2:17 SmCo permanent magnet by Nd doping |
| Chao-Zhong Wang(王朝中)1, Lei Liu(刘雷)1,2,†, Ying-Li Sun(孙颖莉)1,2, Jiang-Tao Zhao(赵江涛)1, Bo Zhou (周波)1, Si-Si Tu(涂思思)1, Chun-Guo Wang(王春国)1, Yong Ding(丁勇)1,‡, and A-Ru Yan(闫阿儒)1,2 |
1 CISRI&NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences(CAS), Ningbo 315201, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The effects of Nd doping on the microstructures and magnetic properties of Sm$_{1-x}$Nd$_{x}$ (Co$_{0.695}$Fe$_{0.2}$Cu$_{0.08}$Zr$_{0.025}$)$_{7.2}$ ($x=0$, 0.3, 0.5, 0.7, 1.0) permanent magnets are studied. The scanning electron microscope (SEM) analysis of the solid solution states of the magnets shows that with the increase of Nd content, the distribution of elements becomes inhomogeneous and miscellaneous phase will be generated. Positive temperature coefficient of coercivity ($\beta $) appears in each of the samples with $x=0.3$, 0.5, and 0.7. The corresponding positive $\beta $ temperatures are in ranges of about 70 K-170 K, 60 K-260 K, 182 K-490 K for the samples with $x=0.3$, 0.5, and 0.7, respectively. Thermomagnetic analysis shows that spin-reorientation-transition (SRT) of the cell boundary phase is responsible for this phenomenon. On the basis of this discovery, the Sm$_{0.7}$Nd$_{0.3}$ (Co$_{0.695}$Fe$_{0.2}$Cu$_{0.08}$Zr$_{0.025}$)$_{7.2}$ magnet possessing thermal stability with $\beta \approx -0.002 $ %/K at the temperature in a range of 150 K-200 K is obtained.
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Received: 18 March 2022
Revised: 11 May 2022
Accepted manuscript online: 18 May 2022
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PACS:
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07.55.-w
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(Magnetic instruments and components)
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75.50.Vv
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(High coercivity materials)
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68.60.Dv
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(Thermal stability; thermal effects)
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76.30.Kg
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(Rare-earth ions and impurities)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3803003 and 2021YFB3503101), the Major Project of “Science and Technology Innovation 2025” in Ningbo, China (Grant No. 2020Z044), the Zhejiang Provincial Key Research and Development Program, China (Grant No. 2021C01172), and the National Natural Science Funds of China (Grant No. 51601209). |
Corresponding Authors:
Lei Liu, Yong Ding
E-mail: liulei@nimte.ac.cn;dingyong@nimte.ac.cn
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Cite this article:
Chao-Zhong Wang(王朝中), Lei Liu(刘雷), Ying-Li Sun(孙颖莉), Jiang-Tao Zhao(赵江涛), Bo Zhou (周波), Si-Si Tu(涂思思), Chun-Guo Wang(王春国), Yong Ding(丁勇), and A-Ru Yan(闫阿儒) Improvement of coercivity thermal stability of sintered 2:17 SmCo permanent magnet by Nd doping 2023 Chin. Phys. B 32 020704
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