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The Microstructural Characterization of Nanocrystalline CeO2 Ceramics Produced by the Sol-Gel Method

Published online by Cambridge University Press:  15 February 2011

F. Czerwinski  and
J.A. Szpunar
F. Czerwinski
Affiliation:
Department of Metallurgical Engineering, McGill University, Montreal, Que., H3A 2A7, Canada
J.A. Szpunar
Affiliation:
Department of Metallurgical Engineering, McGill University, Montreal, Que., H3A 2A7, Canada
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Abstract

CeO2 ceramics were manufactured in the form of surface coatings deposited onto various substrates by sol-gel technology. The size of the CeO2 crystallites, dried at room temperature, was about 5 nm and did not change significantly after heating, up to 680 K. Further increase of the temperature resulted in a rapid growth of crystallites. The process of growth depends also on the film thickness and nature of substrate. The results obtained using thermogravimetric analysis (TGA) and infrared spectroscopy (IR) demonstrated that the thermal decomposition of gel was completed at about 750 K. There was no evident texture in both the as-deposited state and after heat-treatment. X-ray diffraction (XRD), the atomic force microscopy (AFM), and transmission electron microscopy (TEM) were used to characterize the structure of coatings. The examples of application of CeO2 ceramics as coatings for high temperature corrosion protection are presented. The role of size of CeO2 particles in modification of grain boundary transport is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 343: Symposium H – Polycrystalline Thin Films - Structure, Texture, Properties and Applications , 1994 , 535
Copyright
Copyright © Materials Research Society 1994

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References

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