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Effect of Ni doping on the phase stability and conductivity of scandia-stabilized zirconia

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Volume
180
Identifiers
DOI: 10.1016/j.ssi.2008.12.003
Keywords
  • Scandia-Stabilized Zirconia
  • Ni
  • Phase Transition
  • Electrical Conductivity
  • Thick Film Electrolyte
  • Solid Oxide Fuel Cell

Abstract

Abstract The effect of Ni doping on the phase stability and conductivity of scandia-stabilized zirconia (SSZ) thick film was studied. A free-standing 10SSZ thick-film (10 mol% Sc 2O 3-stabilized zirconia, ~ 10 μm thick) that was previously in contact with a Ni layer during co-firing was fabricated. The 10SSZ thick-film showed a cubic phase in contrast to the rhombohedral phase shown for a bulk 10SSZ sample. The Ni content in the SSZ thick film was ~ 1.7 mol%. The effect of Ni on the cubic phase formation was also confirmed by the similar observation of the cubic phase in the Ni-doped bulk 10SSZ sample. The observed conductivity behavior also supported the XRD observation. Ni was found to hinder the transformation of the cubic phase to the rhombohedral on cooling in 10SSZ samples after a reduction treatment.

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