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Structure and magnetic properties of melt-spun Sm–Fe–Nb ribbons and their nitrides

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Abstract

SmFe10−xNb x (x = 0, 0.1, 0.2, 0.3) ribbons and their nitrides were prepared by melt-spinning, followed by annealing and subsequent nitriding. The structure and magnetic properties were investigated by means of X-ray diffraction (XRD) using the Rietveld method, vibrating sample magnetometer (VSM), transmission electron microscope (TEM) and Mössbauer spectroscopy. XRD analysis shows that the addition of Nb can impede the precipitation of Sm2Fe17 and α-Fe phases and the Nb atoms occupy 2e site in the alloys. At 300 K, the mean hyperfine fields of 2e site are 29.58 T with Nb doping at x = 0.1 and the corresponding Curie temperature is 552 K. The optimal properties of remanence of Br = 0.9 T, intrinsic coercivity of Hcj = 741.5 kA·m−1, and maximum magnetic energy product of (BH)max = 124.2 kJ·m−3 are gained at x = 0.10 in the nitrides.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51501016) and the National Key Research and Development Program (No. 2016YFB0700902).

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Authors and Affiliations

  1. National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co. Ltd., Beijing, 100088, China

    Wen-Long Yan, Yang Luo, Dun-Bo Yu, Gui-Yong Wu, Ning-Tao Quan, Yuan-Fei Yang, Hai-Jun Peng & Zi-Long Wang

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  1. Wen-Long Yan
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Yan, WL., Luo, Y., Yu, DB. et al. Structure and magnetic properties of melt-spun Sm–Fe–Nb ribbons and their nitrides. Rare Met. 37, 232–236 (2018). https://doi.org/10.1007/s12598-018-1004-3

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  • DOI: https://doi.org/10.1007/s12598-018-1004-3

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