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A Subnanoscale Study of Segregation at CdO/Ag(Au) Heterophase Interfaces

Published online by Cambridge University Press:  21 March 2011

Jason T. Sebastian ,
Olof C. Hellman  and
David N. Seidman
Jason T. Sebastian
Affiliation:
Department of Materials Science and Engineering, Northwestern University2225 N. Campus Drive Evanston, IL 60208-3108, U.S.A.
Olof C. Hellman
Affiliation:
Department of Materials Science and Engineering, Northwestern University2225 N. Campus Drive Evanston, IL 60208-3108, U.S.A.
David N. Seidman
Affiliation:
Department of Materials Science and Engineering, Northwestern University2225 N. Campus Drive Evanston, IL 60208-3108, U.S.A.
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Abstract

Three-dimensional atom-probe (3DAP) microscopy permits the atom-by-atom reconstruction of a small volume (typically 10 nm × 10 nm × 100 nm) of a material with respect to both the positions and chemical identities of individual atoms. It is, therefore, ideally suited for the study of solute segregation at internal heterophase interfaces. We present recent results of a 3DAP microscopy study of solute segregation at ceramic/metal (C/M) heterophase interfaces prepared by internal oxidation. In particular, results on the CdO/Ag(Au) (where Au is the segregating species) system are presented. In the 3DAP atomicreconstructions, the interfaces of nanometer-size CdO ceramic particles are delineated as Cd isoconcentration surfaces. The distribution of the segregating species as a function of distance to the isoconcentration surfaces is determined with the proximity histogram (or proxigram) method. Two interfaces are investigated in detail. The first shows no appreciable Au segregation, while the second exhibits segregation with a Gibbsianinterfacial excess of 1.65 nm-2 at 650°°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 654: Symposia AA – Structure-Property Relationships of Oxide Surfaces & Interfaces , 2000 , AA4.9.1
Copyright
Copyright © Materials Research Society 2001

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