Isothermal carbothermal reduction of synthetic FeTiO₃-Fe₂O₃ solid solutions

FeTiO₃ and FeTiO₃-Fe₂O₃ solid solution systems were synthesized based on the ceramic method. The synthetic FeTiO₃-Fe₂O₃ solid solutions were subjected to isothermal carbothermal reduction experiments at 1150℃ combining with thermodynamic anal-ysis. The synthetic products were systematically studied by X-ray diffraction and scanning electron microscopy-energy dispersive spec-troscopy. The results show that the synthetic products are all ideal with homogeneous components. From the view of reduction, the smaller the value of x, the molar fraction of FeTiO₃, the earlier the carbothermal reduction of xFeTiO₃-(1-x)Fe₂O₃ solid solutions start, and the higher the maximum reduction rate is. As an intermediate phase, pseudobrookite (FeTi₂O₅-Fe₂TiO₅ (Fe³Ti₃O₁₀)) does not disappear during the whole initial reduction stage until the formation of metal iron (Fe) and ulv-spinel (Fe₂TiO₄).