TY - JOUR
T1 - The chemistry and structure of {222} CdO/Ag heterophase interfaces on an atomic scale
AU - Chan, D. K.
AU - Seidman, D. N.
AU - Merkle, K. L.
N1 - Funding Information:
This research is supported by the US Department of Energy, Basic Energy Sciences-Materials Science, under award No. DE FGO2-89ER45403/05, and contract W-31-109-ENG-38. This work made use of the MRL Central Facilities which are supported by the National Science Foundation, at the Materials Research Center of Northwestern University, under award No. DMR-9120521.
PY - 1996/3
Y1 - 1996/3
N2 - 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.
AB - 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.
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U2 - 10.1016/0169-4332(95)00404-1
DO - 10.1016/0169-4332(95)00404-1
M3 - Article
AN - SCOPUS:0030562766
SN - 0169-4332
VL - 94-95
SP - 409
EP - 415
JO - Applied Surface Science
JF - Applied Surface Science
ER -