Analytically pure Fe2O3, Al2O3 and TiO2 were used as raw materials, batched in the TiO2: Fe2O3: Al2O3 mass ratio of 0: 44: 56 and 2: 44:56, respectively, and pressed into specimens with size of Φ25 mm × 30 mm. The green specimens were fired in a CO2 and CO mixing atmosphere at 1550 oC for 6hrs. The fired specimens were characterized by XRD, Rietveld refinement, SEM, EDS, and XPS to investigate the existing state of TiO2 in the synthesized specimens. The results show that after firing at 1550 oC for 6 hrs, the specimen added with TiO2 has a homogeneous structure and as its phase. The introduced TiO2 participates in the synthesis reaction of hercynite and enters into crystal lattices of hercynite in the form of Ti4+. Ti4+ occupies the tetrahedron and octahedron positions, increasing the lattice constant.

Keywords: Structure, Hercynite, Tetrahedron, Octahedron,