TY - JOUR
T1 - Atomic-scale studies of silver segregation at MgO/Cu heterophase interfaces
AU - Shashkov, D. A.
AU - Seidman, D. N.
N1 - Funding Information:
This research was supported by the US Department of Energy, Basic Energy Sciences-Materials Science, under award No. DE FG02-89ER45403/05. This work made use of the MRL Central Facilities which are supported by the National Science Foundation, at the Materials Research Center of North-western University, under award No. DMR-9120521. Drs. D.K. Chan, H. Jang and G.P.E.M. Van Bakel are thanked for useful discussions.
PY - 1996/3
Y1 - 1996/3
N2 - Atom-probe field-ion microscopy (APFIM) is used to measure quantitatively the absolute values of the Gibbsian interfacial excess of Ag, Γ Ag , at semi-coherent {222} MgO/Cu(Ag) heterophase interfaces. Atomically clean metal oxide/metal heterophase interfaces were obtained by internal oxidation of a pure ternary Cu(Mg,Ag) single-phase alloy to produce octahedral-shaped MgO precipitates, 10 to 30 nm in diameter, in a single-phase Cu(Ag) matrix. Precipitates are faceted on {222} planes. Random-area APFIM analysis was performed in the 〈111〉 direction of the Cu(Ag) matrix, perpendicular to one pair of {222} facets of every MgO precipitate. For a single precipitate dissected on an atomic scale, segregation levels at both "front" and "rear" interfaces are determined. The average measured value of Γ Ag , at 500 °C, is (2 ± 0.6) × 10 15 atoms cm -2 . This corresponds to about one monolayer coverage.
AB - Atom-probe field-ion microscopy (APFIM) is used to measure quantitatively the absolute values of the Gibbsian interfacial excess of Ag, Γ Ag , at semi-coherent {222} MgO/Cu(Ag) heterophase interfaces. Atomically clean metal oxide/metal heterophase interfaces were obtained by internal oxidation of a pure ternary Cu(Mg,Ag) single-phase alloy to produce octahedral-shaped MgO precipitates, 10 to 30 nm in diameter, in a single-phase Cu(Ag) matrix. Precipitates are faceted on {222} planes. Random-area APFIM analysis was performed in the 〈111〉 direction of the Cu(Ag) matrix, perpendicular to one pair of {222} facets of every MgO precipitate. For a single precipitate dissected on an atomic scale, segregation levels at both "front" and "rear" interfaces are determined. The average measured value of Γ Ag , at 500 °C, is (2 ± 0.6) × 10 15 atoms cm -2 . This corresponds to about one monolayer coverage.
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U2 - 10.1016/0169-4332(95)00526-9
DO - 10.1016/0169-4332(95)00526-9
M3 - Article
AN - SCOPUS:0030562850
SN - 0169-4332
VL - 94-95
SP - 416
EP - 421
JO - Applied Surface Science
JF - Applied Surface Science
ER -