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TEM and XAS Characterization of Hard Magnetic Phase in Nd-Fe Alloys

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Abstract

Nd80Fe20 alloys were prepared by copper mold casting and directional solidification (DS) to obtain a coarse microstructure, which can be identified unambigously. The mold-cast samples exhibit a fine globular eutectic structure and show high room temperature coercivity (∼ 5 kOe). Transmission electron microscopic (TEM) investigations reveal the presence of fcc (a = 5.32 Å) Nd-rich and nanocrystalline non-cubic Fe-rich phases. The directionally solidified (DS) samples exhibit large grains (composition close to NdFe2). The NdFe2 grains (formed in the DS samples) show clear magnetic domains with uniaxial anisotropy indicating that the NdFe2-type phase observed in the present samples is not a cubic phase. X-ray absorption spectroscopy (XAS) was used to analyze the local configuration around Fe atoms in the mold-cast samples. The XAS patterns do not match with the bcc and fcc standards, which supports the presence of NdFe2 phase with uniaxial symmetry in the DS samples.

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Acknowledgments

The authors thank S. Schinnerling for help with the magnetic domain observation. This work was supported by the German Science Foundation (DFG) via the DFG priority program “Phasenumwandlungen in mehrkomponentigen Schmelzen” under grant Ec 111/11-1,2.

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Authors and Affiliations

  1. Institute for Metallic Materials, IFW Dresden, D-01171, Dresden, Germany

    G. Kumar, W. Löser, C. Mickel & L. Schultz

  2. Department of Materials and Earth Sciences, Physical Metallurgy Division, TU Darmstadt, D-64287, Darmstadt, Germany

    J. Eckert

  3. Department of Mechanical Engineering, University of New Orleans, New Orleans, USA

    P. Schilling

  4. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, USA

    E. Ma

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  1. G. Kumar
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Kumar, G., Eckert, J., Löser, W. et al. TEM and XAS Characterization of Hard Magnetic Phase in Nd-Fe Alloys. MRS Online Proceedings Library 806, 143–148 (2003). https://doi.org/10.1557/PROC-806-MM3.2

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  • DOI: https://doi.org/10.1557/PROC-806-MM3.2

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