Composition and structure of the Cu/MgO {222} heterophase interface on an atomic scale

H. Jang*, David N Seidman, K. L. Merkle

*Corresponding author for this work

Research output: Contribution to journalArticle


The chemical composition and structure of the Cu/MgO {222} heterophase interface is studied using a combination of transmission electron microscopy, high resolution electron microscopy and atom-probe field-ion microscopy techniques. Cu/MgO {222} interfaces are produced by forming MgO precipitates in a Cu matrix by internally oxidizing a Cu-2.8 at.% Mg alloy. The MgO precipitates have a semicoherent interface with the Cu matrix and they exhibit a cube-on-cube orientation relationship. The octahedrally-shaped MgO precipitates were analyzed using APFIM by dissecting along a 〈111〉 direction on an atomic scale. In this manner an MgO precipitate, with a {222} plane perpendicular to the axis of the APFIM, is uncovered after the Cu matrix has been mass analyzed. It is found that the terminating {222} plane of an MgO precipitate is pure oxygen, and the second {222} plane is pure Mg.

Original languageEnglish (US)
Pages (from-to)397-400
Number of pages4
JournalMaterials Science Forum
StatePublished - Dec 1 1994


ASJC Scopus subject areas

  • Materials Science(all)

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