摘要：In this research, the influence of cobalt compositions in CoFe 2 O 4 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 CoFe 2 O 4 . 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 CoFe 2 O 4 affect the CoFe 2 O 4 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.
关键词：CoFe 2 O 4 ; Co-precipitation method ; Thermal properties ; Microstructures ; Magnetic properties
