Extraordinary fast oxide ion conductivity in La1.61GeO5-δ thin film consisting of nano-size grain

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Abstract

Thin films of La1.61GeO5-δ, a new oxide ionic conductor, were fabricated on dense polycrystalline Al2O3 substrates by a pulsed laser deposition (PLD) method and the effect of the film thickness on the oxide ionic conductivity was investigated on the nanoscale. The deposition parameters were optimized to obtain La1.61GeO5-δ thin films with stoichiometric composition. Annealing was found necessary to get crystalline La1.61GeO5-δ thin films. It was also found that the annealed La1.61GeO5-δ film exhibited extraordinarily high oxide ionic conductivity. Due to the nano-size effects, the oxide ion conductivity of La1.61GeO5-δ thin films increased with the decreasing thickness as compared to that in bulk La1.61GeO5-δ. In particular, the improvement in conductivity of the film at low temperature was significant .The electrical conductivity of the La1.61GeO5-δ film with a thickness of 373 nm is as high as 0.05 S cm- 1 (log(σ/S cm- 1) = - 1.3) at 573 K.

Original languageEnglish
Pages (from-to)1733-1736
Number of pages4
JournalSolid State Ionics
Volume177
Issue number19-25 SPEC. ISS.
DOIs
Publication statusPublished - Oct 15 2006

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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