Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 47, Issue 10, Pages 3259-3262Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2011.2153833
Keywords
Dy2O3; DyF3 doping; microstructure; magnetic property; Nd-Fe-B sintered magnets
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Magnetic and microstructural properties of (Nd-26.06, Dy-6.51)-Fe-bal.-B-0.97-M-2.39 (wt.%) (M = Cu, Al, Co, and Nb) sintered magnets doped with Dy2O3 and DyF3 powders were studied. In the case of the Dy2O3-doped magnet, Dy was distributed along the near grain boundaries. In contrast, the DyF3-doped magnet and the undoped magnet showed that Dy was distributed uniformly in the main phase. The coercivity and the remanence of the Dy2O3 ff and DyF3-doped magnets were 33.2 kOe, 11.64 kG, and 34.5 kOe, 11.21 kG, respectively. The coercivity of the DyF3-doped magnet was the largest but its remanence was the smallest among other magnets because the Dy was distributed throughout the main phase. Uniform distribution of the Dy in the DyF3-doped magnet was probably due to their lower bonding energy and higher chemical potential for diffusion.
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