This work presents the Zr⁴⁺-substituted CoFe₂O₄ nanocrystallites at lower concentrations prepared via sol-gel method in order to investigate their structural and magnetic properties along with their impedance properties. XRD patterns confirm the inverse spinel phase of CoFe₂O₄ and the presence of zirconium (Zr) nanoparticles in the spinel network. The crystallite size was found to decrease after Zr substitution. CoFe₂O₄ nanocrystallites of 34-nm size and lattice parameter slightly increase with Zr⁴⁺ substitution into cobalt ferrite as observed from the XRD pattern. The presence of all functional groups involved in the present synthesis was determined from FTIR spectroscopy. Characteristic peaks of cubic spinel structured cobalt ferrites are observed in the Raman spectrum of each ferrite composition. The HRSEM images revealed the spherical morphology and nanosize of the Zr⁴⁺-doped CoFe₂O₄ nanocrystallites. EDX analysis confirmed that the applied process for the fabrication of Co_1-xZr_xFe₂O₄ nanoparticles is a proper process for the synthesis of spinel cobalt ferrites with homogeneity in composition. The TEM images evidently exposed formation of well-shaped nanoparticles and the fringes are uniform with 0.44-nm width and the selected area electron diffraction pattern exposed periodic arrangements. The results of magnetic hysteresis revealed that the zirconium-substituted cobalt ferrite nanoparticles increase the saturation magnetization and coercivity with increasing zirconium content. Impedance increased when Zr⁴⁺ was substituted, but for higher concentration it was reduced.

这项工作提出了通过溶胶-凝胶法制备的低浓度Zr ⁴⁺取代的CoFe ₂ O ₄纳米晶体，以研究其结构和磁性以及阻抗特性。XRD图谱证实了CoFe ₂ O _4的尖晶石反相和尖晶石网络中锆（Zr）纳米粒子的存在。发现在Zr取代后微晶尺寸减小。Zr ⁴⁺使具有34nm尺寸和晶格参数的CoFe ₂ O ₄纳米微晶增加从X射线衍射图可知，铁氧体被置换成钴铁氧体。通过FTIR光谱确定了本合成中涉及的所有官能团的存在。在每种铁素体成分的拉曼光谱中观察到立方尖晶石结构的钴铁氧体的特征峰。HRSEM图像揭示了Zr ⁴⁺掺杂的CoFe ₂ O ₄纳米晶体的球形形态和纳米尺寸。EDX分析证实了Co _1-x Zr _x Fe ₂ O ₄的制造工艺纳米颗粒是合成组成均一的尖晶石钴铁氧体的合适方法。TEM图像明显暴露出形状良好的纳米颗粒，条纹均匀，宽度为0.44 nm，所选区域的电子衍射图显示周期性排列。磁滞的结果表明，锆取代的钴铁氧体纳米颗粒随着锆含量的增加而增加了饱和磁化强度和矫顽力。取代Zr ⁴⁺时，阻抗增加，但浓度较高时，阻抗降低。