HIGH-RESOLUTION ELECTRON-MICROSCOPY OF CU/MGO AND PD/MGO INTERFACES

Cu/ (1 $($) over bar$$ 11) MgO and Pd/ (1 $($) over bar$$ 11) MgO interfaces with a cube-on-cube relation are produced by internal oxidation technique. High resolution transmission electron microscopy has been applied to study the interface structure of Cu/ (1 $($) over bar$$ 11) MgO and Pd/ (1 $($) over bar$$ 11) MgO. In contrast to a previous work in which cases the core structure of interfacial dislocation in Cu/ (1 $($) over bar$$ 11) MgO and Pd/ (1 $($) over bar$$ 11) MgO interfaces can not be directly observed from the high resolution image, we have observed the localized interfacial dislocation in both Cu/(1 $($) over bar$$ 11) MgO and Pd/ (1 $($) over bar$$ 11) MgO interfaces from high resolution images. The atomic structure of these two metal/ oxide interfaces are determined from through-focal series of high resolution images. The terminating lattice plane in the interface is the oxygen lattice plane for both Cui (1 $($) over bar$$ 11) MgO and Pd/ (1 $($) over bar$$ 11) MgO interfaces which are composed of the distorted structural units of Cu(2)0 and PdO, respectively. Junction dislocation resemble to that in the grain boundary facets related to the difference of the rigid body translations between two energenticallty equivalent {111} facets in the Cu/ MgO and Pd/ MgO interfaces is observed. The Burgers vector of the junction dislocation is 1/6 < 112 > and a stacking fault in the soft metal matrix accompanying with this junction dislocation is found.