57Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE-Fe-B permanent magnets

doi:10.1088/1674-1056/abc53d

Abstract This review summarizes the recent advances on the application of ⁵⁷Fe Mössbauer 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 ∆ E_Q of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field B_hf increases 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 Mössbauer 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.

Keywords: ⁵⁷Fe Mössbauer spectrometry Nd-Fe-B-based permanent magnets (Ce Nd)₂Fe₁₄B phase grain boundary phase

Received: 28 May 2020
Revised: 22 October 2020
Accepted manuscript online: 28 October 2020

PACS:

33.45.+x

(M?ssbauer spectra)

Fund: 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), and Ten Thousand Talents Plan of Zhejiang Province, China (Grant No. 2018R52003).

Corresponding Authors: ^†Corresponding author. E-mail: lzzhao@hdu.edu.cn ^‡Corresponding author. E-mail: zhang@hdu.edu.cn

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Lizhong Zhao(赵利忠), Xuefeng Zhang(张雪峰), Mi Yan(严密), Zhongwu Liu(刘仲武), and Jean-Marc Greneche ⁵⁷Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE-Fe-B permanent magnets 2021 Chin. Phys. B 30 013302

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57Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE-Fe-B permanent magnets

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⁵⁷Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE-Fe-B permanent magnets