Abstract
Moiré fringe contrast in plan-view transmission electron microscopy (TEM) is adapted to measure the Burgers vector of misfit dislocations at the interface between FeAl and AlAs. This technique had originally been used to determine the Burgers vector of dislocations in bulk materials. The aluminide was grown by molecular beam epitaxy on AlAs which was pseudomorphic on GaAs(001). The observed misfit dislocations are determined to have [100] and [010] Burgers vectors, as measured in the FeAl, with [010] and [100] line directions, respectively. These are pure edge dislocations which cannot glide on the {110} or {112} slip systems of FeAl. This requires that the misfit dislocations either form at the edges of islands, during three dimensional (3D) growth or by climb from the free surface during two-dimensional (2D) growth. The TEM results along with in situ reflection high-energy electron diffraction (RHEED) results show that the growth is indeed 2D which suggests the misfit dislocations must form by dislocation half-loops climbing from the free FeAl surface.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.