The purpose is to investigate the crystal structure and magnetic properties of MgFe₂O₄ ferrites with divalent Co²⁺ cations substitute in Co_xMg_1-xFe₂O₄ (x = 0.0, 0.2, 0.5, 0.8, and 1.0) successfully synthesized using standard ceramic technology. The crystal structure, valence state distribution, functional groups, ion occupancy rate and magnetic properties were systematically investigated, revealing that the changes in magnetic properties are closely related to the microstructure. All samples were characterized by XRD as a pure spinel structure with space group Fd-3m. The intrinsic coercivity (H_c), saturation magnetization (M_s) and core loss (P_cv) performance of Co²⁺ ions doped MgFe₂O₄ ferrites were significantly optimized under the appropriate doping level. H_c and M_s continuously strengthen in the range of 0 ≤ x ≤ 1 at 300 K, where the maximum saturation magnetization (M_s) reaches 102.0 emu/g and the maximum intrinsic coercive force reaches 253.9 Oe. Besides, compared with x = 1, the sample obtained the lowest core loss and comparatively high magnetic susceptibility at x = 0.8. Simultaneously, the saturation magnetization and coercivity at 300 K are 76.5 emu/g and 184.7 Oe, respectively. Comprehensive experimental results show that the sample possesses a wider range of application when the doping amount x = 0.8.

目的是成功研究Co _x Mg _{1- x} Fe ₂ O ₄（x  = 0.0、0.2、0.5、0.8和1.0）中具有二价Co ²⁺阳离子替代物的MgFe ₂ O ₄铁氧体的晶体结构和磁性。使用标准陶瓷技术合成。系统地研究了晶体结构，价态分布，官能团，离子占有率和磁性能，发现磁性能的变化与微观结构密切相关。所有样品均通过XRD表征为空间群Fd -3 m的纯尖晶石结构。在适当的掺杂水平下，Co ²⁺掺杂的MgFe ₂ O ₄铁氧体的固有矫顽力（H _c），饱和磁化强度（M _s）和铁损（P _cv）性能得到了优化。ħ _Ç和中号_小号不断加强的范围0≤ X ≤1在300 K，其中最大饱和磁化强度（中号_小号）达到102.0鸸鹋/克，最大本征矫顽力达到253.9奥斯特。此外，与x相比 = 1，样品在x  = 0.8时获得最低的磁芯损耗和较高的磁化率。同时，在300 K下的饱和磁化强度和矫顽力分别为76.5 emu / g和184.7 Oe。综合实验结果表明，当掺杂量x  = 0.8时，样品具有更广阔的应用范围。