Phase transformation in anisotropic nanocrystalline SmCo5 magnets
Phase transformation in anisotropic nanocrystalline SmCo5 magnets
复制标题
各向异性纳米晶 SmCo5 磁体的相变
DOI：
10.1016/j.jmmm.2018.08.041
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发表时间：
2019
影响因子：
2.7
通讯作者：
Jiang CB
中科院分区：
文献类型：
--
作者：
An Shizhong;Li Wuhui;Song Kexing;Zhang Tianli;Jiang Chengbao;An Shizhong;Li Wuhui;Song Kexing;An SZ;Jiang CB
具有优异织构的SmCo 5纳米片在高性能纳米复合永磁材料中具有巨大的应用潜力，其中硬磁相的相结构是获得大矫顽力的关键。在600-650 °C烧结时，观察到各向异性纳米晶SmCo 5磁体从1：5 H相到2：17 R相的相变。相变是有趣的，因为根据热力学和动力学分析，1：5 H相是相对稳定的。湿磨各向异性磁体的相变导致其矫顽力比干磨1：5 H单相各向同性磁体低得多。差示扫描量热法、热重分析和X射线能谱分析表明，相变是由于大比表面积的纳米片在烧结过程中发生氧化而引起的。结果表明，在烧结过程中严格控制氧含量是保证纳米片烧结制备的各向异性纳米晶SmCo 5磁体保持1：5 H单相的必要条件。
SmCo5nanoflakes with excellent texture have great potential applications in high performance nanocomposite magnets, in which the phase structure of the hard magnetic phase is crucial for obtaining large coercivity. Phase transformation from 1:5H phase to 2:17 R phase is observed in anisotropic nanocrystalline SmCo5magnets when sintering the nanoflakes at 600–650 °C. The phase transformation is interesting because the 1:5H phase is relatively stable according to the thermodynamic and kinetic analysis. The phase transformation results in much lower coercivity of the wet-milled anisotropic magnets when compared with dry-milled isotropic magnets with 1:5H single phase. Analyses of differential scanning calorimetry, thermogravity and energy dispersive X-ray validate that the phase transformation originates from the oxidation of the nanoflakes with large specific surface area during sintering. The results suggest that controlling oxygen content strictly during sintering is necessary for maintaining 1:5H single phase in anisotropic nanocrystalline SmCo5magnets prepared by sintering the nanoflakes.
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影响因子：
3.2
作者：
Liyun Zheng;A. Gabay;Wanfeng Li;B. Cui;G. Hadjipanayis
通讯作者：
Liyun Zheng;A. Gabay;Wanfeng Li;B. Cui;G. Hadjipanayis
影响因子：
3.7
作者：
SKOMSKI, R;COEY, JMD
通讯作者：
COEY, JMD
影响因子：
6.2
作者：
L. Cataldo;A. Lefevre;F. Ducret;M. Cohen‐Adad;C. Allibert;N. Valignat
通讯作者：
L. Cataldo;A. Lefevre;F. Ducret;M. Cohen‐Adad;C. Allibert;N. Valignat
影响因子：
2.1
作者：
Fingers, RT;Rubertus, CS
通讯作者：
Rubertus, CS
影响因子：
9.4
作者：
Cui, B. Z.;Li, W. F.;Hadjipanayis, G. C.
通讯作者：
Hadjipanayis, G. C.