Production of high conductivity composite zirconia solid oxide electrolytes with good mechanical strength through net-shape

M Ghatee, MH Shariat, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Yttria- and scandia-doped zirconia composite solid electrolytes were prepared by impregnation of a porous tetragonal 3 mol% Y2O3 zirconia matrix with a solution of scandium nitrate in a net-shape type process. The resulting composite exhibited both high conductivity (0.01 S cm(-1) at 903 K) and good mechanical strength and fracture toughness. This excellent performance can be attributed to the achievement of a favourable inhomogeneous structure of the core-shell type. Grain surfaces are enriched with scandia dopant to improve both crystal and grain boundary conductivities with formation of cubic zirconia at these interfaces, whilst retaining the small grain size of the tetragonal phase, which optimises mechanical properties and favours production of thin electrolytes.

Original languageEnglish
Pages (from-to)5237-5242
Number of pages6
JournalJournal of Materials Chemistry
Volume18
Issue number43
Early online date30 Aug 2008
DOIs
Publication statusPublished - 2008

Keywords

  • YTTRIA-STABILIZED ZIRCONIA
  • FUEL-CELLS
  • ELECTRICAL-CONDUCTIVITY
  • IONIC-CONDUCTIVITY
  • GAS SENSORS
  • CERAMICS
  • TEMPERATURE
  • SCANDIA
  • MICROSTRUCTURE
  • PERFORMANCE

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