In this report, sol–gel synthesized CoFe_2−xSn_xO₄ (x = 0.00, 0.05, 0.10, 0.15, 0.20) nanoparticles (NPs) were prepared from metal chloride precursors. To identify the ferrite phase formation TGA/TDA analysis was performed. X-ray diffraction (XRD) analysis confirms the formation of face centered cubic spinel structure of the CoFe₂O₄ NPs. Octahedral shaped crystalline ferrite nanoparticles are confirmed from Scanning electron microscopy (SEM) study. The crystallite size estimated from XRD data is well agreed with particles size measured from transmission electron microscope (TEM) image. Fourier Transform Infrared (FTIR) spectroscopy result shows the octahedral and tetrahedral stretching vibrational bonds, respectively. EDX analysis suggests the successful substitution of Sn in the CoFe_2−xSn_xO₄. The room temperature and at 50 K magnetization measurement shows the ferromagnetic behavior. The maximum coercivity (H_c) and saturation magnetization (M_s) was found to be 1081 Oe and 54 emu g⁻¹ for x = 0.00, 0.20 sample. The variation of saturation magnetization with Sn doping has been discussed through Co²⁺ and Fe³⁺ cation distribution of spinel CoFe₂O₄. The law of approach method is used to calculate the values of anisotropy constant (K). The values of K for different Sn doping are found to be 3.051, 2.740, 2.623, 2.944 and 3.239 × 10⁵ ergs/cm³, respectively. The change of coercivity (1081–636 Oe) with Sn substitution of has a direct relationship with crystallite size as well domain wall movement of ferromagnetism.

在本报告中，溶胶-凝胶合成的 CoFe _2-x Sn _x O ₄ (x = 0.00, 0.05, 0.10, 0.15, 0.20) 纳米粒子 (NPs) 由金属氯化物前体制备。为了识别铁氧体相的形成，进行了 TGA/TDA 分析。X 射线衍射 (XRD) 分析证实了 CoFe ₂ O ₄的面心立方尖晶石结构的形成NP。八面体形状的结晶铁氧体纳米颗粒从扫描电子显微镜 (SEM) 研究中得到证实。从 XRD 数据估计的微晶尺寸与从透射电子显微镜 (TEM) 图像测量的颗粒尺寸非常一致。傅里叶变换红外 (FTIR) 光谱结果分别显示了八面体和四面体伸缩振动键。EDX 分析表明在 CoFe _2-x Sn _x O _{4 中}成功取代了 Sn 。室温和 50 K 磁化测量显示铁磁行为。发现最大矫顽力 ( H _c ) 和饱和磁化强度 ( M _s ) 为 1081 Oe 和 54 emu g ^-1对于 x = 0.00，0.20 样本。已经通过尖晶石CoFe ₂ O _{4 的}Co ²⁺和Fe ³⁺阳离子分布讨论了Sn掺杂对饱和磁化强度的变化。逼近定律用于计算各向异性常数 (K) 的值。发现不同 Sn 掺杂的 K 值分别为 3.051、2.740、2.623、2.944 和 3.239 × 10 ⁵  ergs/cm ³。Sn取代的矫顽力（1081-636 Oe）的变化与微晶尺寸以及铁磁性的畴壁运动有直接关系。