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Science of Ceramic Interfaces II by Nowotny J.

By Nowotny J.

This number of papers arose from the lawsuits of the overseas Workshop on Interfaces of Ceramic fabrics held in Australia, 1993 and is a continuation of the former ebook released lower than a similar name. the target of the Workshop used to be to debate examine development at the chemistry of ceramic interfaces and similar business elements. as a result of multidisciplinary personality of ceramic interfaces the booklet includes articles overlaying a number of components of workmanship, together with ceramics, floor technological know-how, stable nation electrochemistry, metallurgy and hot temperature chemistry. a few technical papers also are integrated during this quantity.

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When the segregation enrichment is very high then introduction of traces of elements may be sufficient to modify entirely the interface composition. Also modification of nonstoichiometry in the boundary layer in a controlled way requires knowledge of segregation equilibria. 4. One should evaluate the relationship between interface chemistry and materials properties. In order to address this issue there is a need to accumulate a data base on chemical composition of interfaces and related properties such as electric properties and dielectric properties.

1. INTRODUCTION Typically, crystalline ceramics are fabricated from fine particle size powders, powders with an average particle size in the range of a few tenths to several microns. As a result of the free particle size, the specific surface area of the powders, and of compacts formed from them, is typically of the order of several m2/g. Pore structures in well-packed compacts also have a characteristic dimension of the order of a micron or less, and thus, during sintering, the evolution of micron or submicron scale void networks and voids is of interest.

Awareness is growing that cooling results in substantial changes in properties of the interface layer. One source of these changes is the formation of concentration gradients in the interface layer as a result of the incorporation of elements coming from the gas phase, such as oxygen. Another effect results from local changes in segregation equilibria. Superposition of these effects may result in a complicated picture of the interface layer. By varying the cooling rate and the gas phase composition one can impose the concentration gradients in a controlled way.

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