Nitrogenation of the magnetic compound R(Fe,M)12

The diffusion mechanism of nitrogen atoms in ThMn12-type crystal structure compounds was investigated by using x-ray diffraction, Mössbauer spectroscopy measurements, thermopiezic analysis, and differential thermal analysis. The studies indicate that the distribution of nitrogen atoms in a R(Fe,M)12...

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Bibliographic Details
Published in:Journal of applied physics 1998-02, Vol.83 (4), p.1983-1987
Main Authors: Yang, Jinbo, Mao, Weihua, Yang, Yingchang, Ge, Senlin, Zhao, Zhenjie, Li, Fashen
Format: Article
Language:English
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Summary:The diffusion mechanism of nitrogen atoms in ThMn12-type crystal structure compounds was investigated by using x-ray diffraction, Mössbauer spectroscopy measurements, thermopiezic analysis, and differential thermal analysis. The studies indicate that the distribution of nitrogen atoms in a R(Fe,M)12 particles with intermediate N content is characterized by a nitrided region and an unnitrided region. The results confirmed that this two-phase region is stable, and the nitrogen atoms do not diffuse further into the particle. Based on the characteristics of the nitrogenation, a trapping diffusion model is applied to the R(Fe,M)12 system. On the basis of this study high performance magnetic powders of NdFe10.5Mo1.5Nx were successfully prepared.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.366926