应用穆斯堡尔谱学方法半定量测定了Fe-Cr-Co-Mo永磁合金在最佳磁性状态两相的成分及相对量。Fe-23Cr-15Co-2Mo-0.5Ti柱晶合金和Fe-30Cr-25Co-3Mo-1Ni-0.5Zr等轴晶合金的a_1相分别为78Fe-18Co-4Cr和60Fe-37Co-3Cr。a_2相分别为12Fe-3Co-85Cr和9Fe-3Co-88Cr,a_1相的相对量分别为0.72和0.62。结合透射电子显微镜,磁转矩仪和冲击磁测仪测定了合金中强磁性相粒子的尺寸,单轴各向异性常数和合金矫顽力等磁性能参数。按单畴粒子理论计算了合金的矫顽力,所得结果与实测值符合较好,从而认为Fe-Cr-Co-Mo合金的高矫顽力来自于单畴粒子的磁矩转动。 The composition and relative amount of two phases of Fe-Cr-Co-Mo permanent magnet alloy in the best magnetic state were semi-quantitatively determined by Mossbauer spectroscopy. The a_1 phases of the Fe-23Cr-15Co-2Mo-0.5Ti columnar alloy and the Fe-30Cr-25Co-3Mo-1Ni-0.5Zr equiaxed alloy were 78Fe-18Co-4Cr and 60Fe-37Co-3Cr, respectively. a_2 phase are 12Fe-3Co-85Cr and 9Fe-3Co-88Cr respectively, the relative amounts of a_1 phase are 0.72 and 0.62, respectively. The magnetic parameters such as size, uniaxial anisotropy constant and coercivity of the ferromagnetic phase in the alloy were measured by transmission electron microscopy, magnetic torque meter and impact magnetometer. The coercive force of the alloy was calculated according to the single-domain particle theory. The obtained results are in good agreement with the measured values. It is concluded that the high coercivity of the Fe-Cr-Co-Mo alloy is due to the magnetic moment rotation of the single-domain particles.