Preparation and characterization of dense Ce0.85Y0.15O2-δ ceramics

J. Ma, T. S. Zhang, L. B. Kong, P. Hing, Yongjun Leng, S. H. Chan

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    The precursor powder of Ce0.85Y0.15 O2-δ has been prepared via oxalate coprecipitation high high purity reagents of Ce(NO3)3·6H2O and Y(NO3)3·6H2O. The sinterability, densification and microstructural development have been examined. At all the sintering temperatures used from 1000 to 1550 °C, no intragranular pores are observed. All the pores are located at the grain boundaries or at the triple points. The sample sintered at 1300 °C for 3 h has over 98.0% relative density, and a mean grain size of ∼1.55 μm. Nearly all the pores are eliminated from the sintered bodies, when the sintering temperature is higher than 1300 °C. Higher ionic conductivity [e.g., 4.59 (Ωm)-1 at 750 °C in air] is obtained for the Ce0.85Y0.15 O2-δ ceramic sintered at 1300 °C in 3 h. This sample has a fracture toughness of 1.49±0.2 MPa m1/2. However, no fracture toughness dependence of grain size is found for dense Ce0.85Y0.15O2-δ ceramics.

    Original languageEnglish (US)
    Pages (from-to)2641-2648
    Number of pages8
    JournalJournal of the European Ceramic Society
    Volume24
    Issue number9
    DOIs
    StatePublished - Aug 1 2004

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    Fracture toughness
    Sintering
    Oxalates
    Ionic conductivity
    Coprecipitation
    Densification
    Powders
    Grain boundaries
    Temperature
    Air

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Materials Chemistry

    Cite this

    Ma, J. ; Zhang, T. S. ; Kong, L. B. ; Hing, P. ; Leng, Yongjun ; Chan, S. H. / Preparation and characterization of dense Ce0.85Y0.15O2-δ ceramics. In: Journal of the European Ceramic Society. 2004 ; Vol. 24, No. 9. pp. 2641-2648.
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    abstract = "The precursor powder of Ce0.85Y0.15 O2-δ has been prepared via oxalate coprecipitation high high purity reagents of Ce(NO3)3·6H2O and Y(NO3)3·6H2O. The sinterability, densification and microstructural development have been examined. At all the sintering temperatures used from 1000 to 1550 °C, no intragranular pores are observed. All the pores are located at the grain boundaries or at the triple points. The sample sintered at 1300 °C for 3 h has over 98.0{\%} relative density, and a mean grain size of ∼1.55 μm. Nearly all the pores are eliminated from the sintered bodies, when the sintering temperature is higher than 1300 °C. Higher ionic conductivity [e.g., 4.59 (Ωm)-1 at 750 °C in air] is obtained for the Ce0.85Y0.15 O2-δ ceramic sintered at 1300 °C in 3 h. This sample has a fracture toughness of 1.49±0.2 MPa m1/2. However, no fracture toughness dependence of grain size is found for dense Ce0.85Y0.15O2-δ ceramics.",
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    Preparation and characterization of dense Ce0.85Y0.15O2-δ ceramics. / Ma, J.; Zhang, T. S.; Kong, L. B.; Hing, P.; Leng, Yongjun; Chan, S. H.

    In: Journal of the European Ceramic Society, Vol. 24, No. 9, 01.08.2004, p. 2641-2648.

    Research output: Contribution to journalArticle

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    AU - Zhang, T. S.

    AU - Kong, L. B.

    AU - Hing, P.

    AU - Leng, Yongjun

    AU - Chan, S. H.

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