Effect of lattice distortion induced by Ce chemical valence on coercivity of Nd-Ce-Fe-B alloy
Effect of lattice distortion induced by Ce chemical valence on coercivity of Nd-Ce-Fe-B alloy
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Ce价态引起的晶格畸变对Nd-Ce-Fe-B合金矫顽力的影响
DOI：
10.1016/j.jallcom.2021.162486
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Li Longgui
中科院分区：
文献类型：
--
作者：
Yang Munan;Luo Sangen;Sajjad Ur Rehman;Liu Chao;Li Jiajie;Yu Xiaoqiang;Li Longgui
采用快速凝固法制备了(Nd1−xCex)31.5Fe67.5B1(x=0，0.15，0.2，0.25，0.3，0.5，0.75wt%)合金。发现在x=0.2时，矫顽力Hci反常地增加到1427.33 kA/m。随着Ce含量的变化，Ce的价态从4f1(+3)态向4f0(+4)态移动。在x=0.2时，Ce3+的含量较高，有利于Ce2Fe14B型永磁材料的磁硬化。同时，大半径Ce3+所占比例较高，小半径Ce4+所占比例较小，促进了晶格参数的离散变化。第一性原理计算表明，不同的Ce替代占据不同的位置，晶格参数变化较大。结果，在合金内部形成了晶格扭曲和散射应力场。这种磁场具有较高的磁化场壁能量，阻碍了磁化过程中磁化场区的移动。
The (Nd1−xCex)31.5Fe67.5B1(x = 0, 0.15, 0.2, 0.25, 0.3, 0.5, 0.75 wt%) alloys were prepared by rapid solidification method. It is found that the coercivity,Hci, abnormally increased to 1427.33 kA/m at x = 0.2. With the change of Ce content, the valence state of Ce shifted between 4 f1(+3) state and 4 f0(+4) state. In the x = 0.2 ribbon, the Ce3+has a high proportion, which is beneficial to the magnetic hardening of Ce2Fe14B type permanent magnetic materials. Meanwhile, the higher proportion of large radius Ce3+and a lower proportion of small radius Ce4+promoted the discrete change of the lattice parameters. The first principle calculations showed a large variation of lattice parameters with different Ce substitution occupying different positions. As a result, lattice distortions and scattered stress fields are formed inside the alloy. Such fields have high domain wall energy which hinder the movement of the domain walls during the process of reverse magnetization.
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影响因子：
2.7
作者：
Pei, Kun;Zhang, Xing;Yan, Aru
通讯作者：
Yan, Aru
影响因子：
2.7
作者：
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影响因子：
3.2
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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