Subnanometer three-dimensional atom-probe investigation of segregation at MgO/Cu ceramic/metal heterophase interfaces

J. T. Sebastian*, J. Rüsing, O. C. Hellman, D. N. Seidman, W. Vriesendorp, B. J. Kooi, J. Th M. De Hosson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Three-dimensional atom-probe (3DAP) microscopy has been applied to the study of segregation at ceramic/metal (C/M) interfaces. In this article, results on the MgO/Cu(X) (where X=Ag or Sb) systems are summarized. Nanometer-size MgO precipitates with atomically clean and atomically sharp interfaces were prepared in these systems by internal oxidation. Segregation of the ternary component (Ag or Sb) at the MgO/Cu heterophase interface was enhanced by extended low-temperature anneals. Magnesia precipitates in the 3DAP reconstructions were delineated as isoconcentration surfaces, and segregation of each ternary component at the C/M interfaces was analyzed with the proximity histogram method developed at Northwestern University. This method allows the direct extraction of the Gibbsian interfacial excess of solute at the C/M interfaces from the experimental data. A value of (3.2±2.0)×1017m-2 at 500°C is obtained for the segregation of Ag at a MgO/Cu(Ag) interface, while a value of (2.9±0.9)×1018m-2 at 500°C is obtained for the segregation of Sb at a MgO/Cu(Sb) interface. The larger Gibbsian excess for Sb segregation at this ceramic/metal heterophase interface is most likely due to the so-called pΔV effect.

Original languageEnglish (US)
Pages (from-to)203-213
Number of pages11
JournalUltramicroscopy
Volume89
Issue number1-3
DOIs
StatePublished - 2001

Keywords

  • Ceramic/metal
  • Heterophase interfaces
  • MgO/Cu
  • Segregation
  • Three-dimensional atom-probe microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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