The influence of calcination temperature on the optical properties of hematite (α-Fe₂O₃)

Abstract- The influence of calcination temperature on the optical properties of antiferromagnetic materials has been researched. Hematite (α-Fe₂O₃) is antiferromagnetic material with a rhombohedral lattice shape which has stable properties due to the influence of heat. The methods used are co-precipitation, which produces precursors in the form of FeCl3. Test results with X-ray fluorescence (XRF) showed that the biggest mineral content is with percentage of 98.02% Fe2O3 and test results with DTA-TGA showed occurrence of depreciation 1.8 mg mass at a temperature of 280 °C and 2.7 mg at a temperature of 860 °C, while testing by UV-Vis spectrometer was obtained absorbance of each is 1.573 a.u. at a temperature of 700 °C, 1.308 a.u at a temperature of 800 °C, 1.225 a.u at a temperature of 860 °C and 0.847 a.u at a temperature of 900 °C which can be regarded as a semiconductor material with a large energy gap of each that is 1.862eV, 1.948eV, 2.044eV and 2.243eV.

Keywords— Hematite, X-Ray Fluorescence (XRF), Co-precipitation, Calcination, Energy Gap, UV-Vis Spectrometer.