| 57Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets |
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| 引用本文： | 赵利忠,张雪峰,严密,刘仲武,Jean-Marc Greneche.57Fe M?ssbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets[J].中国物理 B,2021(1). |
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| 作者姓名： | 赵利忠 张雪峰 严密 刘仲武 Jean-Marc Greneche |
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| 作者单位： | Institute of Advanced Magnetic Materials;State Key Laboratory of Silicon Materials;School of Materials Science and Engineering;Institut des Molécules et Matériaux du Mans CNRS UMR-6283 |
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| 基金项目： | Project supported by the Zhejiang Provincial Natural Science Foundation of China(Grant Nos.LY20E010002,LR18E010001,and LD19E010001);the National Natural Science Foundation of China(Grant Nos.U1704253 and 51801047);Liaoning Revitalization Talents Program(Grant No.XLYC1807177);the Key Research and Development plan of Zhejiang Province,China(Grant No.2020C05014);Ten Thousand Talents Plan of Zhejiang Province,China(Grant No.2018R52003)。 |
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| 摘 要： | This review summarizes the recent advances on the application of 57Fe M?ssbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the Ce2Fe14B,(Ce,Nd)2Fe14B and MM2Fe14B phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting ?EQ of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field Bhfincreases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by the 57Fe M?ssbauer spectrometry due to its high sensitivity. On this basis,the content, magnetic behavior, and magnetization of the REFe2 phase, the amorphous grain boundary(GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.
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| 关 键 词： | 57Fe M?ssbauer spectrometry Nd–Fe–B-based permanent magnets (Ce Nd)2Fe14B phase grain boundary phase |
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