Atomic structure of gold and copper boundaries

摘要

A very thin bicrystal film, prepared by depositing gold onto a {111} germanium substrate, then annealing and removing it, has been studied by RREM. The crystals grow predominantly in the orientations (111) and (1{top}-1{top}-1{top}-) which ate related by a 60 rotation (∑3 CSL) and bounded by {112} facets. In contrast to the boundaries studied in thicker films, these {112} facets extend through the depth of the film. Another crystal within the film also had a {111} orientation, but rotated by around 20 from the other crystals. A short length of boundary was found that was edge-on, symmetrical, facetted on (213) planes, and corresponding to ∑7 (or ∑21). A copper 1111 film did not show edge-on boundaries. The rigid body translation across the facets were measured and found to vary depending on the proximity to facet junctions. An expansion at the boundary was the general case.