Science of Sintering (Jan 2013)

Structural and electrical properties of Ti doped α-Fe2O3

  • Nikolić M.V.,
  • Sekulić D.L.,
  • Nikolić N.,
  • Slankamenac M.P.,
  • Aleksić O.S.,
  • Danninger H.,
  • Halwax E.,
  • Pavlović V.B.,
  • Nikolić P.M.

DOI
https://doi.org/10.2298/SOS1303281N
Journal volume & issue
Vol. 45, no. 3
pp. 281 – 292

Abstract

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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]

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