In this research, the influence of cobalt compositions in CoFe₂O₄ using co-precipitation method in low calcination temperature of 200 °C has been obtained. Microstructures, thermal and magnetic properties were analyzed starting Thermogravimetric Analysis /Differential Scanning Calorimetry (TGA /DSC), X-ray Diffraction (XRD), Field Emission - Scanning Electron Microscope (FE-SEM). Vibrating Sample Magnetometer (VSM) used for analyzing magnetic properties of CoFe₂O₄. The reductions of mass change are in the range of 7.62 % at 95 °C–300 °C and endothermic process at 800 °C. Microstructures from XRD results confirmed that influences of cobalt in CoFe₂O₄ affect the CoFe₂O₄ crystal and its peak decreases as Co compositions increases. Then FE-SEM EDS confirmed spinel ferrite structure in Sample 1, Sample 2 and Sample 3, while the distribution of particle size on histograms confirmed that Sample 1, 2 and 3 are around 55.6 nm, 45.3 nm and 39.6 nm consecutively. The results from FE-SEM measurement showed that the increases of Co compositions decreased the particle size. Also seen from FE-SEM results that with low calcination temperatures resulting the spinel ferrite. Then, the optimum of the conditions magnetic properties was observed for Sample 3 with Ms = 21.74 emu.g^-1, Mr = 2.37 emu.g^-1, Hc = 556.572 Oe respectively.

在本研究中，使用共沉淀法在 200 °C 的低煅烧温度下获得了 CoFe ₂ O ₄中钴成分的影响。从热重分析/差示扫描量热法(TGA/DSC)、X射线衍射(XRD)、场发射-扫描电子显微镜(FE-SEM)开始分析微观结构、热和磁性能。用于分析 CoFe ₂ O ₄磁性的振动样品磁强计 (VSM) 。在 95 °C–300 °C 和 800 °C 的吸热过程中，质量变化的减少范围为 7.62%。XRD 结果的微观结构证实 CoFe ₂ O ₄中钴的影响会影响 CoFe ₂O ₄晶体及其峰值随着Co成分的增加而减小。然后 FE-SEM EDS 证实了样品 1、样品 2 和样品 3 中的尖晶石铁氧体结构，而柱状图上的粒径分布证实样品 1、2 和 3 连续在 55.6 nm、45.3 nm 和 39.6 nm 附近。FE-SEM 测量结果表明 Co 成分的增加降低了粒径。从 FE-SEM 结果还可以看出，在低煅烧温度下产生尖晶石铁氧体。然后，对于样品3观察到磁性能的最佳条件，分别为Ms = 21.74 emu.g ^-1，Mr = 2.37 emu.g ^-1，Hc = 556.572 Oe。