Atomic-scale structure and chemistry of ceramic/metal interfaces - II. Solute segregation at MgO/Cu (Ag) and CdO/Ag (Au) interfaces

D. A. Shashkov*, D. A. Muller, D. N. Seidman

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

42 Scopus citations

Abstract

The first quantitative measurements of solute segregation at ceramic/metal (C/M) heterophase interfaces are presented for the MgO/Cu (Ag) and CdO/Ag (Au) systems. Interfaces are produced by internal oxidation of ternary alloys. Solute segregation at C/M interfaces is induced by intermediate-temperature annealing treatments. The Gibbsian interfacial excess of solute, Γsolute, at these interfaces is determined in a direct, quantitative manner by atom-probe field-ion microscopy (APFIM). These measurements are complemented in the MgO/Cu (Ag) system by a composition analysis of this interface employing electron energy loss spectroscopy (EELS). Analyses of 15 {222} MgO/Cu (Ag) interfaces by APFIM show an average segregation level of (4.0±1.9)×1014 atoms/cm2 or 0.22±0.10 effective monolayers at 500 °C. Analyses of three {222} CdO/Ag (Au) interfaces show an average segregation level of (3.0±1.0)×1014 atoms/cm2 or 0.22±0.07 effective monolayers at 400 °C. Whereas {222} CdO/Ag (Au) interfaces in unannealed specimens show no evidence of gold segregation. These results are discussed in view of recent models of interfacial segregation.

Original languageEnglish (US)
Pages (from-to)3953-3963
Number of pages11
JournalActa Materialia
Volume47
Issue number15
DOIs
StatePublished - Nov 1999
EventProceedings of the 1998 ACTA Materiala Workshop on 'Materials Science and Mechanics of Interfaces' - La Jolla, CA, USA
Duration: Oct 25 1998Oct 30 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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