Gd substitution for Ce in preparing (Ce,Gd)-Fe-B magnets
Gd substitution for Ce in preparing (Ce,Gd)-Fe-B magnets
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Gd替代Ce制备(Ce,Gd)-Fe-B磁体
DOI：
10.1016/j.jallcom.2017.09.243
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发表时间：
2017-12
影响因子：
6.2
通讯作者：
Bao-gen Shen
中科院分区：
文献类型：
--
作者：
Zhu-bai Li;Dong-shan Wang;Zhi-xin Zhang;Xue-feng Zhang;Feng-xia Hu;Ji-rong Sun;Bao-gen Shen
Ce-Fe-B系稀土合金是部分替代Nd-Fe-B系永磁体的替代材料，可以降低成本，平衡稀土元素的使用。但Ce-Fe-B磁体的矫顽力较低，部分原因是Ce 2Fe 14 B相的不稳定性和低的磁晶各向异性。本文研究了用Gd替代Ce制备的Ce_（13-x）Gd_xFe_（81）B_6薄带的磁性能。X射线衍射分析表明，少量Gd取代Ce后，主相衍射峰强度增加，这是由于Gd提高了R2 Fe 14 B相的稳定性，减少了非晶相的数量。尽管Gd_2Fe_（14）B的磁晶各向异性低于Ce_2Fe_（14）B，但少量Gd替代Ce_（12）Gd_1Fe_（81）B_6的磁晶各向异性可提高到5.88 kOe。当Gd原子百分比大于3%时，矫顽力下降，剩磁显著下降。随着Gd原子百分比的增加，居里温度单调增加。Henkel图表明，Gd取代Ce可增强交换耦合效应，这是由于主相交换系数的增加以及非晶相数量的减少。研究表明，少量Gd的取代有利于提高磁性能，但剩磁没有明显下降。
Ce-Fe-B rare-earth alloys are alternative to substitute partially for Nd-Fe-B permanent magnets for reducing the cost and the balance use of rare-earth elements. However, coercivity is rather low in Ce-Fe-B magnets, which partially ascribes to the instability of Ce2Fe14B phase and the low magnetocrystalline anisotropy. In this paper, magnetic properties are investigated in Ce13-xGdxFe81B6ribbons via substituting of Gd for Ce. X-ray diffraction shows that a little amount of Gd substitution for Ce leads to an increase in the intensity of diffraction peak for main phase, which should be attributed to the improvement of the stability of R2Fe14B phase and the reduction in the amount of amorphous phase. Even though the magnetocrystalline anisotropy is lower in Gd2Fe14B than that in Ce2Fe14B, the coercivity increases to 5.88 kOe for a little amount of Gd substitution in Ce12Gd1Fe81B6ribbons. For Gd atomic percent more than 3% the coercivity decreases, and the remanence drops significantly. With the increase of Gd atomic percent, Curie temperature increases monotonically. Henkel plots indicate that Gd substitution for Ce could enhance the effect of exchange coupling, which owes to the increase of exchange coefficient in main phase as well as to the reduction in the amount of amorphous phase. These investigations show that a little amount substitution of Gd is beneficial to improve the magnetic properties without a significant drop of the remanence.
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