The chemistry and structure of {222} CdO/Ag heterophase interfaces on an atomic scale

D. K. Chan*, D. N. Seidman, K. L. Merkle

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The chemistry and structure of {222} CdO/Ag (ceramic/metal) heterophase interfaces are determined with sub-nanometer chemical and structural spatial resolution employing atom-probe field-ion and high-resolution electron microscopies. The interfaces are produced in a controlled manner via internal oxidation of a Ag-1.62at%Cd alloy, which results in the formation of CdO precipitates in a Ag matrix. The CdO precipitates are octahedral-shaped with facets on the {222} polar planes, and have a cube-on-cube orientation relationship with the Ag matrix. Atom-probe analyses are made along the chemically-ordered CdO 〈111〉-type directions, thereby perpendicularly intersecting the {222} interfaces. A total of 35 {222} heterophase interfaces is chemically analyzed, of which 19 have the chemical sequence Ag|O|Cd|... and 16 the sequence Ag|Cd|O|.... High resolution electron microscopy analyses reveal that the {222} facet planes of the CdO precipitates contain atomic height ledges, therefore indicating that the preciptates were in a coarsening stage. The combined atom-probe and high-resolution electron microscope results demonstrate that the chemistry of the terminating {222} facet plane of CdO is controlled by coarsening kinetics.

Original languageEnglish (US)
Pages (from-to)409-415
Number of pages7
JournalApplied Surface Science
Volume94-95
DOIs
StatePublished - Mar 1996

    Fingerprint

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this