Sinterability and ionic conductivity of coprecipitated Ce 0.8Gd0.2O2-δ powders treated via a high-energy ball-milling process

T. S. Zhang, J. Ma, L. B. Kong, P. Hing, Y. J. Leng, S. H. Chan, J. A. Kilner

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

Ceria-based solid solutions are promising electrolytes for intermediate-temperature, solid oxide fuel cells. The effect of a dry, high-energy, ball-milling process on the sintering and densification behaviour of coprecipitated ceria-based powders is investigated by means of X-ray diffraction, Brunauer-Emmett-Teller (BET) surface-area measurements, density measurements, and electron microscopy. The dry ball-milling process leads to (i) a larger specific surface-area with weak agglomeration; (ii) rearrangement of grains into dense granules; (iii) a higher green density. These effects significantly reduce sintering temperatures and promote densification of ceria-based ceramics. Moreover, a comparison is made of the sintering behaviour and ionic conductivity of the milled samples with and without cobalt oxide doping. Cobalt oxide is a very effective sintering aid, but usually results in an enlarged grain-boundary effect for Si-containing samples. Thus, since SiO2 is a ubiquitous background impurity in both raw materials and ceramic processing, the dry ball-milling process is a more feasible method for improving the sinterability of coprecipitated ceria-based powders.

Original languageEnglish (US)
Pages (from-to)26-33
Number of pages8
JournalJournal of Power Sources
Volume124
Issue number1
DOIs
StatePublished - Oct 1 2003

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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