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Structural and electrical properties of sintered Fe2O3/TiO2 nanopowder mixtures

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2014
Authors
Đurić, Zorka Ž.
Aleksić, Obrad S.
Nikolić, Maria Vesna
Labus, Nebojša
Radovanović, Milan
Luković, Miloljub D.
Article (Published version)
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Abstract
Starting nanopowders of TiO2 (anatase 99.7%) and α-Fe2O3 (hematite) were mixed in the weight ratios 60:40 and 40:60. Green samples were sintered in the temperature range 750–1250 °C in air. Structural, morphological and electrical studies were carried out using XRD, SEM and EDS analysis, Hall measurements and electrical conductivity measurements. The aim was analyzing the influence of the starting nanopowder structure on the resulting sample composition, density, grain size and electrical resistivity in view of tailoring properties for developing different applications such as anodes for photoelectrochemical cells, photocatalysts and gas sensors. Compared to pure anatase samples, the presence of hematite lowered the temperature of completion of the anatase to rutile phase transformation to 850 °C. Formation of pseudobrookite was also noted at this temperature. Higher sintering temperatures lead to increased sample density, changes in grain size (grain growth and inhomogenous microstruc...ture) and decreased electric resistivity.

Keywords:
grain growth / sintering / dielectric properties / electrical conductivity / pseudobrookite
Source:
Ceramics International, 2014, 40, 9 Part B, 15131-15141
Publisher:
  • Elsevier
Projects:
  • Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-45007)

DOI: 10.1016/j.ceramint.2014.06.126

ISSN: 0272-8842

WoS: 000341343300074

Scopus: 2-s2.0-84905899479
[ Google Scholar ]
14
14
URI
http://dais.sanu.ac.rs/123456789/540
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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