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Quantitative Interfacial Chemistry and Bonding in Ceramic Materials

Published online by Cambridge University Press:  15 February 2011

Hui Gu
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
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Abstract

Internal interfaces, between the same phase (grain boundary) or two different phases, often play an essential role in controlling various properties in ceramic materials. Analysis of such interfaces can achieve various newly available quantitative information on a sub-nanometer scale, as well as bonding picture associated with these interfaces. This analysis combines EELS spectrum profiling and advanced near-edge structure (ELNES) data processing, taking advantage from both the high spatial and energy resolutions provided by a dedicated STEM instrument. Demonstrated by chemical and structural study of gram boundary and inter-phase interfaces in Si3N4 ceramics where ∼1 ran thick amorphous phases cover every crystalline boundaries, it reveals that the amorphous boundary films are substantially different to bulk amorphous phase and to the interface between crystalline and amorphous phases. Moreover, the boundaries between two different crystalline phases were found covered with two thin amorphous layers of different composition and bonding. These observations can shed further light on the influence of interfaces on the macroscopic properties of these ceramic materials. This interfacial analuysis method can be extended to broader research area in solid state physics and chemistry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 703
Copyright
Copyright © Materials Research Society 1997

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References

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