Co_0.5Mg_0.5-xCu_xFe₂O₄ (x = 0.0, 0.2 and 0.4) nanoferrites were prepared by sol–gel auto combustion method. XRD, FT-IR, and HRTEM studies revealed the single-phase spinel cubic crystal structure of all samples with Fd-3 m space group. The lattice constant, calculated using the XRD data, was found in the range 8.3936–8.4735 Å. The average crystallite sizes were found to be in the range of between 38.8 and 49.9 nm. The microstructural behavior and elemental composition of all samples were detected by FE-SEM and EDS, respectively. FTIR curves showed two absorption bands ʋ₁ with higher frequency and ʋ₂ with a lower frequency, indicating metal cation and oxygen bond stretching at tetrahedral and octahedral sites. DC resistivity was decreased with increasing the content of copper. VSM study confirmed the ferrimagnetic behavior of all samples. The values of remnant ratios obtained from VSM data showed their isotropic nature forming single domains ferrimagnetic particles

 通过溶胶-凝胶自动燃烧法制备了Co _0.5 Mg _{0.5- x} Cu _x Fe ₂ O ₄  （x = 0.0、0.2和0.4）纳米铁氧体。XRD，FT-IR和HRTEM研究揭示了Fd-3 m空间群所有样品的单相尖晶石立方晶体结构。使用XRD数据计算出的晶格常数在8.3936–8.4735Å范围内。发现平均微晶尺寸在38.8至49.9nm之间的范围内。通过FE-SEM和EDS分别检测所有样品的微观结构行为和元素组成。FTIR曲线显示两个吸收带ʋ ₁ 与更高的频率和ʋ ₂ 具有较低的频率，表明金属阳离子和氧键在四面体和八面体位置拉伸。直流电阻率随铜含量的增加而降低。VSM研究证实了所有样品的亚铁磁行为。从VSM数据获得的剩余比率值表明它们的各向同性性质形成了单畴亚铁磁性颗粒