Deposition, Structure, and Properties of Cermet Thin Films Composed of Ag and Y-Stabilized Zirconia

L. S. Wang, S. A. Barnett

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Ag1–x[(Y2O3)0.1(ZrO2)0.9]x(YSZ) cermet thin films have been deposited by reactive magnetron cosputtering from Ag and Zr/Y targets in Ar–O2 mixtures. The deposition conditions were such that the YSZ component in the films was fully oxidized. The film densities varied from ≈75% to >85% as the total pressure was decreased from 20 to 5 mTorr. Film resistivities p varied with Ag volume fraction fAg from 5 × 10–6 Ω–cm to > 109 Ω–cm. For fAg < 0.4, ρ decreased rapidly with increasing fAg. For fAg > 0.4, p decreased more gradually with increasing fAg. ρ in annealed films ranged from 4 × 10–4 Ω–cm for fAg = 0.4 to 5 × 10–6 Ω–cm for pure Ag. Long term (>100 h) annealing at ≥ 700°C resulted in a gradual increase in cermet resistivity due to Ag evaporation and Ag segregation to surface islands. Both decomposition mechanisms were effectively suppressed at up to 750°C by depositing a 1 μm thick porous perovskite cap layer on the cermet. Complex impedance spectroscopy measurements in air of cermet electrodes on YSZ electrolytes gave interfacial resistances that were a factor of ≈6 lower than those of pure Ag electrodes, eg., 1.4 Ω–cm2 at 750°C. Ag–YSZ cermets thus have potential as high–conductivity, low–overpotential air electrode materials for solid–oxide electrochemical devices operating at temperatures ≤750°C.

Original languageEnglish (US)
Pages (from-to)1134-1140
Number of pages7
JournalJournal of the Electrochemical Society
Volume139
Issue number4
DOIs
StatePublished - Apr 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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