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Influence of Ca-Doping on Chemistry and Force Balance at Grain Boundary in Si3N4

Published online by Cambridge University Press:  10 February 2011

Hui Gu
Affiliation:
Japan Science and Technology Corporation, “Ceramics Superplasticity” project, JFCC 2F, 2–4–1 Mutsuno, Atsuta, Nagoya 456, Japan, gu@ngo.jst-c.go.jp
Manfred Rühle
Affiliation:
Max-Planck-Institut für Metallforschung, Seestr. 92, 70174 Stuttgart, Germany
Corresponding
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Abstract

High-purity HIPed Si3N4 ceramics doped systematically with Ca additives are analyzed quantitatively by EELS. Using an ELNES related method to obtain film composition, we found that the composition difference from film to film is less significant than segregation. This is interpreted as a change of film width related to grain surface faceting. The hexagonal structure associated with anisotropie dielectric function can alter van der Waals attraction for different surface structures to produce variations in film thickness with a uniform film composition. These grain boundary films are better described as a high pressure amorphous oxynitride phase that allows higher but still limited solubility of calcium nitrogen.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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References

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