Dynamic aspects of cerium dioxide sintering: HT-ESEM study of grain growth and pore elimination |
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Authors: | Renaud Podor Nicolas ClavierJohann Ravaux Laurent ClaparedeNicolas Dacheux Didier Bernache-Assollant |
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Affiliation: | a Institut de Chimie Séparative de Marcoule, UMR 5257 CEA-CNRS-UM2-ENSCM, Site de Marcoule, Bat 426, BP 17171, F-30207 Bagnols sur Cèze Cedex, France b ENSMSE, 158 Cours Fauriel, 42023 St-Etienne Cedex 2, France |
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Abstract: | Sintering of CeO2 is studied in situ by high temperature scanning environmental microscopy (HT-ESEM) at T = 1400 °C. The morphological modifications of a single grains population are recorded for 6 h. Kinetic parameters are extracted from image series. The local grain growth determined from the single population studied in situ is compared to the general grain growth obtained by classical ex situ technique. Using HT-ESEM for sintering study is validated. The grain boundary velocities range between 0 and 5 μm h−1, with a mean value of about 1 μm h−1. The migration of the intragranular surface pores is described. Their velocities range between 0.4 and 1.2 μm h−1 and depend on pore diameters: the smaller the pore, the faster the pore velocity. The time required to fill a pore that arises at the sample surface is determined as a function of pore diameter. The time for pore elimination dependence with the pore diameters is also established. |
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Keywords: | A. Sintering A. Grain growth Grain boundaries Electron Microscopy CeO2 |
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