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Effects of High Magnetic Fields on Phase Transformations in Amorphous Nd2Fe14B

1
Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
2
Ames Laboratory, 311 Iowa State University, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Magnetochemistry 2019, 5(1), 16; https://doi.org/10.3390/magnetochemistry5010016
Received: 11 January 2019 / Revised: 18 February 2019 / Accepted: 21 February 2019 / Published: 2 March 2019
(This article belongs to the Special Issue Permanent Magnets)
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Abstract

We briefly summarize the results from a set of experiments designed to demonstrate the effects of high magnetic fields applied during thermal annealing of amorphous Nd2Fe14B produced through melt-spinning. A custom-built differential scanning calorimeter was used to determine the crystallization temperatures in zero-field and in applied fields of 20 kOe and 90 kOe, which guided subsequent heat treatments to evaluate phase evolution. X-ray diffraction was used for phase identification and transmission electron microscopy was employed for observation of the crystallite size and morphology. Magnetization measurements were also used to evaluate the resulting magnetic phases after thermomagnetic processing. While the applied magnetic fields do not appear to affect the crystallization temperature, significant effects on the kinetics of phase evolution are observed and correlated strongly to the magnetic behavior. View Full-Text
Keywords: thermomagnetic processing; permanent magnet materials; Nd2Fe14B; X-ray diffraction; magnetometry thermomagnetic processing; permanent magnet materials; Nd2Fe14B; X-ray diffraction; magnetometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kesler, M.S.; Jensen, B.A.; Zhou, L.; Palasyuk, O.; Kim, T.-H.; Kramer, M.J.; Nlebedim, I.C.; Rios, O.; McGuire, M.A. Effects of High Magnetic Fields on Phase Transformations in Amorphous Nd2Fe14B. Magnetochemistry 2019, 5, 16.

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