Open AccessStructural and electrical properties of Ti doped α-Fe2O3
Author(s) -
Maria Vesikolić,
Dalibor L. Sekulić,
Nenad Nikolić,
M. Slankamenac,
O.S. Aleksić,
Herbert Danninger,
E. Halwax,
Vladimir B. Pavlović,
P.M. Nikolić
Publication year - 2013
Publication title -
science of sintering/science of sintering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.309
H-Index - 25
eISSN - 1820-7413
pISSN - 0350-820X
DOI - 10.2298/sos1303281n
Subject(s) - hematite , materials science , doping , electrical resistivity and conductivity , grain boundary , analytical chemistry (journal) , trigonal crystal system , solubility , mineralogy , crystal structure , metallurgy , crystallography , microstructure , chemistry , electrical engineering , optoelectronics , chromatography , engineering
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