摘要
This review summarizes the recent advances on the application of ^(57)Fe Mössbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the Ce_(2)Fe_(14)B,(Ce,Nd)_(2)Fe_(14)B and MM_(2)Fe_(14)B 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 öEQ 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 ^(57)Fe Mössbauer spectrometry due to its high sensitivity. On this basis,the content, magnetic behavior, and magnetization of the REFe_(2) 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.
作者
赵利忠
张雪峰
严密
刘仲武
Jean-Marc Greneche
Lizhong Zhao;Xuefeng Zhang;Mi Yan;Zhongwu Liu;Jean-Marc Greneche(Institute of Advanced Magnetic Materials,College of Materials&Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Key Laboratory of Novel Materials for Information Technology of Zhejiang Province,Zhejiang University,Hangzhou 310027,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Institut des Mol´ecules et Mat´eriaux du Mans CNRS UMR-6283,Le Mans Universit´e,Le Mans F-72085,France)
基金
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)。
