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Relating atomic local structures and Curie temperature of NdFeB permanent magnets: an X-ray absorption spectroscopic study

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Abstract

Relationship between atomic local structures and Curie temperature of NdFeB permanent magnets was investigated semi-quantitatively using synchrotron radiation technique. Fe K-edge X-ray absorption spectroscopy (XAS) was employed to study the local structure of Fe atoms for samples before and after doping Dy, Tb or Gd. It is found that the bond lengths and coordination numbers are changed. Thus, the exchange interaction between Fe atoms increases with Dy, Tb or Gd doping, resulting in the improvement of Curie temperature of NdFeB permanent magnets. The doping effect is proven by experimental measurement of the magnetic properties. Microstructural characterization using scanning electron microscopy (SEM) was also used to further analyze the effect of different rare earth elements doping on Curie temperature of NdFeB permanent magnets.

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Acknowledgements

This work was financially supported by State High-Tech Development Plan (No. 2011AA061901), the Technology Landing Project of Jiangxi Province (No. KJLD13041), the Science and Technology Plan of Ganzhou (No. [2014]131) and the Research Support Plan of Jiangxi University of Science and Technology (No. jxxjbs15001).

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Authors and Affiliations

  1. Institute of Engineering Research, Jiangxi University of Science and Technology, Ganzhou, 341000, China

    Mu-Nan Yang, Hang Wang & Bin Yang

  2. Canadian Light Source, University of Saskatchewan, Saskatoon, SK, S7N 2V3, Canada

    Yong-Feng Hu, Liu-Yi-Mei Yang & Aimee Maclennan

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  1. Mu-Nan Yang
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  2. Hang Wang
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  3. Yong-Feng Hu
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  4. Liu-Yi-Mei Yang
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  5. Aimee Maclennan
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  6. Bin Yang
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Correspondence to Bin Yang.

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Yang, MN., Wang, H., Hu, YF. et al. Relating atomic local structures and Curie temperature of NdFeB permanent magnets: an X-ray absorption spectroscopic study. Rare Met. 37, 983–988 (2018). https://doi.org/10.1007/s12598-017-0918-5

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  • DOI: https://doi.org/10.1007/s12598-017-0918-5

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