Sintering and grain growth of CoO-doped CeO2ceramics

Tianshu Zhang, Peter Hing, Haitao Huang, J. Kilner

Research output: Journal article publicationJournal articleAcademic researchpeer-review

98 Citations (Scopus)

Abstract

Co-doped CeO2powders with atomic ratios equal to 0.25, 1 and 3% were synthesized by the conventional mixed-oxide method. No binary compounds were detected in the CeO2-CoO system, and the Co element exists as the state of Co2+in the samples sintered above 1000°C. A small amount of Co doping reduces sintering temperatures and promotes grain boundary mobility dramatically. Over 99.0% of relative density (R.D.) can be obtained for 0.25% Co-doped sample sintered at 1300°C for 2 h, compared with ∼ 96% of relative density for pure CeO2sintered at 1525°C for 2 h. The results from grain growth kinetics study indicate that grain growth exponent, n, and activation energy, Q, are 3 and 697 ± 37 kJ/mol for pure CeO2, 4 and 572 ± 57 kJ/mol for 0.25% Co-doped CeO2, respectively.
Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalJournal of the European Ceramic Society
Volume22
Issue number1
DOIs
Publication statusPublished - 1 Jan 2002
Externally publishedYes

Keywords

  • CeO 2
  • CoO doping
  • Grain growth
  • Microstructure-final
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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