Magnetic properties and microstructure of (Nd,Dy)–Fe–B magnets with Dy in the range from 0 to 10.3 wt % and oxygen less than 0.26 wt % are studied. High-coercivity magnets with Dy 8 wt % have maximum energy density product (BH)_max ≥ 35 MG Oe and coercivity _МН_с ≥ 30 kOe; their operating temperature can be as high as 180°С. Phase composition and structure of (Nd,Dy)–Fe–B magnets were studied by X-ray diffraction and scanning electron microscopy. In addition to the main (Nd,Dy)₂Fe₁₄B phase and (Nd,Dy)₂O₃ oxide, in triple junctions, there are two (Nd, Dy, Fe, М)O_x phases with fcc structure (symmetry group 225, Fm\(\bar {3}\)m) but with different content of O, Fe, and additional elements M (M = Co, Cu, Ga). It was shown that the total content of (Nd,Dy,Fe,М)O_x oxides grew with the total concentrations of oxygen and dysprosium in magnets.

研究了 (Nd,Dy)-Fe-B 磁体的磁性能和微观结构，其中 Dy 在 0 到 10.3 wt% 的范围内，氧在 0.26 wt% 的范围内。Dy 8 wt% 的高矫顽力磁体具有最大能量密度积 ( BH ) _max ≥ 35 MG Oe 和矫顽力_М Н _с ≥ 30 kOe；它们的工作温度可高达 180°С。通过 X 射线衍射和扫描电子显微镜研究了 (Nd,Dy)-Fe-B 磁体的相组成和结构。三结中除了主要的(Nd,Dy) ₂ Fe ₁₄ B相和(Nd,Dy) ₂ O ₃氧化物外，还有两种(Nd,Dy,Fe,М)O _x具有 fcc 结构的相（对称组 225，Fm \(\bar {3}\) m）但具有不同含量的 O、Fe 和其他元素 M（M = Co、Cu、Ga）。结果表明，(Nd,Dy,Fe,М)O _x氧化物的总含量随着磁体中氧和镝的总浓度而增加。