A subnanoscale study of segregation at CdO/Ag(Au) heterophase interfaces

Jason T. Sebastian*, Olof C. Hellman, David N. Seidman

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


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 atomic reconstructions, 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 Gibbsian interfacial excess of 1.65 nm-2 at 650°C.

Original languageEnglish (US)
Pages (from-to)AA4.9.1-AA4.9.6
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 2001
EventStructure Property Relationships of Oxide Surfaces and Interfaces - Boston, MA, United States
Duration: Nov 27 2000Nov 29 2000

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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