Influences of Co compositions in CoFe2O4 on microstructures, thermal, and magnetic properties
Perdinan Sinuhaji, Tua Raja Simbolon, Muhammadin Hamid, David Arianto Hutajulu, Timbangen Sembiring, Martha Rianna, Masno Ginting
Abstract
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.