Structural and electrical properties of Ti doped α-Fe2O3
AuthorsNikolić, Maria Vesna
Sekulić, D. L.
Aleksić, Obrad S.
Pavlović, Vladimir B.
Nikolić, Pantelija M.
Article (Published version)
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In this work we have analyzed the effects of Ti doping on structural and electrical properties of α-Fe2O3. When the amount of added Ti (5 wt.%TiO2) was within the solubility degree and XRD, SEM and EDS analysis revealed a homogenous hematite structure, with lattice parameters a= 5.03719(3) Å, c=13.7484(1) Å slightly increased due to incorporation of Ti into the rhombohedral hematite lattice. Higher amounts of Ti (10 wt.%TiO2) resulted in the formation of pseudobrookite, besides hematite, confirmed by SEM and EDS analysis. Studies of electric properties in the temperature range 25-225oC at different frequencies (100 - 1Mz) showed that Ti doping improved electrical conductivity. Impedance analysis was performed using an equivalent circuit, showing one relaxation process and suggesting dominant grain boundary contribution. [Projekat Ministarstva nauke Republike Srbije, br. III45014 i br. III43008]
Keywords:X-ray diffraction / electrical properties / scanning electron microscopy / Ti doping / α-Fe2O3
Source:Science of Sintering, 2013, 45, 3, 281-292
- Belgrade : International Institute for the Science of Sintering