Initial sintering stage kinetics of CeO2 studied by stepwise isothermal dilatometry

M. El Sayed Ali, Ole Toft Sørensen

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    Abstract

    The kinetics of the initia l sinterin g stage of CeOis studied by a new dilatometric technique in which the heating of the sample is controlled by its shrinkage rate. By this technique the shrinkage characteristically takes place in "isothermal steps" which allows both the mechanism and its activation energy to be determined in a single experiment. The basic equations necessary to evaluate the shrinkage data are described, and using these equations on the curves recorded for CeO2 it is shown that the controlling mechanism for the initia l
    sintering stage for this oxides is grain-boundary diffusion of Ce4+-ions with an activation energy of 119.4 kcal/mole (5.2 eV). The corresponding diffusion coefficient is estimated to vary between 8.5 x 10-17 - 3.1 x 10-15 cm2/sec (1005 - 1099°C).
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages12
    ISBN (Print)87-550-1085-7
    Publication statusPublished - 1985
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number518
    ISSN0106-2840

    Keywords

    • Risø-R-518
    • Risø-R-518(EN)
    • Activation energy
    • Cerium oxides
    • Dilatometry
    • Isothermal processes
    • Kinetics
    • Powder metallurgu
    • Shrinkage
    • Sintering

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