TY - JOUR
T1 - Atomic-scale structure and chemistry of ceramic/metal interfaces - I. Atomic structure of {222} MgO/Cu (Ag) interfaces
AU - Shashkov, D. A.
AU - Chisholm, M. F.
AU - Seidman, D. N.
N1 - Funding Information:
Stephen J. Pennycook is thanked for kindly and graciously helping to make this STEM study possible at Oak Ridge National Laboratory and for useful discussions. We kindly thank Roy Benedek for many useful discussions and interactions concerning this study and for serving on the Ph.D. thesis committee of D.A.S. This research was supported by the U.S. Department of Energy at Northwestern University under grant DE-FG02-96ER45597 (D.A.S. and D.N.S.), and at Oak Ridge National Laboratory under contract DE-AC05-84OR21400 (M.F.C.).
PY - 1999/11
Y1 - 1999/11
N2 - Ceramic/metal (C/M) {222} MgO/Cu (Ag) heterophase interfaces, prepared by internal oxidation, are studied by scanning transmission electron microscopy (STEM). The observed spacing between misfit dislocations (1.45 nm) in a 〈110〉 projection is in agreement with the prediction of Bollmann's geometric O-lattice theory and experimental values in the literature for {222} MgO/Cu interfaces. It is concluded that the {222} MgO/Cu (Ag) interfaces are semicoherent and contain a trigonal network of pure edge misfit dislocations parallel to 〈110〉-type directions, with an (a/6)〈211〉-type Burgers vector. Misfit dislocations are also found in a standoff position at a distance of a single (111) spacing of the Cu (Ag) matrix. Extra intensity at the interface, in some angular dark-field images indicates silver segregation, in agreement with our atom-probe field-ion microscope results. On the metal side of the interface, extra intensity is observed in five atomic layers, which corresponds to a total silver enrichment of approximately 0.7 effective monolayers.
AB - Ceramic/metal (C/M) {222} MgO/Cu (Ag) heterophase interfaces, prepared by internal oxidation, are studied by scanning transmission electron microscopy (STEM). The observed spacing between misfit dislocations (1.45 nm) in a 〈110〉 projection is in agreement with the prediction of Bollmann's geometric O-lattice theory and experimental values in the literature for {222} MgO/Cu interfaces. It is concluded that the {222} MgO/Cu (Ag) interfaces are semicoherent and contain a trigonal network of pure edge misfit dislocations parallel to 〈110〉-type directions, with an (a/6)〈211〉-type Burgers vector. Misfit dislocations are also found in a standoff position at a distance of a single (111) spacing of the Cu (Ag) matrix. Extra intensity at the interface, in some angular dark-field images indicates silver segregation, in agreement with our atom-probe field-ion microscope results. On the metal side of the interface, extra intensity is observed in five atomic layers, which corresponds to a total silver enrichment of approximately 0.7 effective monolayers.
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U2 - 10.1016/S1359-6454(99)00255-4
DO - 10.1016/S1359-6454(99)00255-4
M3 - Conference article
AN - SCOPUS:0033347892
SN - 1359-6454
VL - 47
SP - 3939
EP - 3951
JO - Acta Materialia
JF - Acta Materialia
IS - 15
T2 - Proceedings of the 1998 ACTA Materiala Workshop on 'Materials Science and Mechanics of Interfaces'
Y2 - 25 October 1998 through 30 October 1998
ER -