Abstract
Abstract Multi-main-phase (MMP) magnets prepared by co-sintering Nd2Fe14B and (Nd,Ce)2Fe14B powders have shown better magnetic properties than the single-main-phase (SMP) magnets with the same average composition, enabling the preparation of high cost-performance permanent magnets with high Ce content. The present work focuses on the squareness factor (Q) of demagnetization curve for MMP Nd-Ce-Fe-B magnets, which represents the magnetic stability in practical applications. It is found that the MMP magnets prepared with larger fraction of (Nd,Ce)2Fe14B components possess higher Q value than those with lower fraction, which highlights the importance of relative fraction between the magnetically softer Ce-rich and the magnetically harder Nd-rich 2:14:1 grains on the squareness for the MMP magnets. Besides, the reduced Ce/Nd gradients within 2:14:1 grains and the formation of continuous RE-rich (RE, rare earth) grain boundaries also make contributions to the recovered squareness factor as well as the sustained coercivity.
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