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Open Access Effect of Dy2O3 intergranular addition on microstructure and magnetic properties of (Nd, Dy)–Fe–B sintered magnets

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Dy2O3 powders with high melting point and low cost have been added into the (Nd, Dy)–Fe–B sintered magnets. Strengthened local magnetocrystalline anisotropy induced by intergranular addition of Dy-containing sources is effective to simultaneously enhance coercivity and minimize remanence loss for Nd2Fe14B-type sintered magnets. In this work, the addition of Dy2O3 promotes the formation of Dy-enriched shells surrounding the 2:14:1 phase grains and reduces the grain size effectively. As a result, the magnetocrystalline anisotropy field H A of the outer regions of the matrix phase is strengthened, accompanied with reduction of local demagnetization stray fields. Enhanced coercivity H cj from 17.5 to 24.3 kOe has been achieved by the addition of 4.0 wt% Dy2O3. The existence of Dy2O3 is also beneficial to improve the grain alignment with the remanence B r maintained above 12.0 kGs. Optimized addition of 2 wt% Dy2O3 gives rise to maximized H cj/kOe+(BH)max/MGOe as a result of balanced coercivity enhancement and magnetic dilution effect. Intergranular addition of Dy2O3 exhibits great potential in producing Nd2Fe14B-based magnets with high coercivity and reduced material cost.

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Keywords: MAGNETIC ANISOTROPY; MAGNETIZATION; MICROSTRUCTURE; PERMANENT MAGNETS; RARE EARTH

Document Type: Short Communication

Publication date: February 1, 2016

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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