Magnetic properties and microstructure of magnesium-doped Nd-Fe-B magnets

A number of Nd15 Fe79−x Mgx B6 magnets with x up to 0.41 and pseudoternary Nd2(Fe1−yMgy)14B compounds with y up to 0.081 have been prepared by conventional powder metallurgy processes. Magnetic measurements indicate that for the magnet alloys i Hc increases as x increases up to 0.25 without a loss i...

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Veröffentlicht in:	J. Appl. Phys.; (United States) 1988-11, Vol.64 (10), p.5513-5515
Hauptverfasser:	LIN, C. H, CHEN, S. K, LIN, K. D, CHANG, W. C, CHIN, T. S
Format:	Artikel
Sprache:	eng
Schlagworte:	360202 > Ceramics, Cermets, & Refractories-- Structure & Phase Studies ALKALINE EARTH METAL COMPOUNDS ALLOYS BORIDES BORON COMPOUNDS COERCIVE FORCE COHERENT SCATTERING Condensed matter: electronic structure, electrical, magnetic, and optical properties CRITICAL TEMPERATURE Cross-disciplinary physics: materials science rheology CRYSTAL STRUCTURE DIFFRACTION Domain effects, magnetization curves, and hysteresis ELECTRON PROBES Exact sciences and technology FABRICATION GRAIN BOUNDARIES IRON BORIDES IRON COMPOUNDS MAGNESIUM ADDITIONS MAGNESIUM ALLOYS MAGNESIUM COMPOUNDS MAGNETIC PROPERTIES Magnetic properties and materials MAGNETS MATERIALS SCIENCE Metals, semimetals and alloys MICROSTRUCTURE NEODYMIUM BORIDES NEODYMIUM COMPOUNDS Other topics in magnetic properties and materials PHYSICAL PROPERTIES Physics PROBES RARE EARTH COMPOUNDS SCATTERING SINTERING Specific materials THERMODYNAMIC PROPERTIES TRANSITION ELEMENT COMPOUNDS TRANSITION TEMPERATURE 360204 > Ceramics, Cermets, & Refractories-- Physical Properties X-RAY DIFFRACTION
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Zusammenfassung:	A number of Nd15 Fe79−x Mgx B6 magnets with x up to 0.41 and pseudoternary Nd2(Fe1−yMgy)14B compounds with y up to 0.081 have been prepared by conventional powder metallurgy processes. Magnetic measurements indicate that for the magnet alloys i Hc increases as x increases up to 0.25 without a loss in Br, hence the (BH)max values are slightly enhanced. The maximum increase in i Hc is about 15% for x=0.25. Extensive Mg-rich precipitates inside the Nd-rich phase have been observed by electron probe microanalysis (EPMA). Higher Mg intensity at grain boundaries is also detected by EPMA. The reasons for the i Hc increase might be the grain boundary cleaning ability of Mg dopant. For the pseudoternary compounds, the anisotropy field HA is found to increase only slightly due to Mg doping while TC remains practically unchanged.
ISSN:	0021-8979 1089-7550
DOI:	10.1063/1.342320