Structural, morphological and electrical properties of alumina/YAG composites as solid electrolyte for IT – SOFC

  • Adela Egelja Institute of Nuclear Sciences Vinča, University of Belgrade
  • Snežana Pašalić Institute of Nuclear Sciences Vinča, University of Belgrade
  • Vladimir Dodevski Institute of Nuclear Sciences Vinča, University of Belgrade
  • Milan Kragović Institute of Nuclear Sciences Vinča, University of Belgrade
  • Ivana Stojković-Simatović Faculty of Physical Chemistry, University of Belgrade
  • Željko Radovanović Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade
  • Marija Stojmenović Institute of Nuclear Sciences Vinča, University of Belgrade

Abstract

Alumina/YAG composites (AYX_t) with high relative density (99.2 %TD) were successfully obtained by mixing commercial alumina powder with different volume fractions of yttrium aluminium garnet (Y3Al5O12-YAG; 7, 14, 21 and 28). YAG was synthetized by nitrate glycine reaction in the form of precursor powder. Polycrystalline YAG powder was obtained by calcination at 950 °C for 2 h. Additionally, obtained compositions were characterized by XRD, SEM, EDX and electrochemical impedance spectroscopy. By XRPD analysis was found that the particle size of YAG powders lies in the nanometric range (being lower than 35 nm). By SEM microphotographs of composites were confirmed the formation of a conductive path consisting from mutually interconnected YAG particles. This was confirmed by the electrochemical impedance spectroscopy. The highest electrical conductivity of grain (κg) and grain boundary (κgb) at 700 ºC amounted to 2.22×10-2 Ω-1cm-1and 9.44×10-3 Ω-1cm-1, respectively, was measured in the composite containing 21 vol% of YAG.

Published
2018-06-13
Issue
Vol 50 No 3 (2018)
Section
Articles

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