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Structural anomalies in undoped gallium arsenide observed in high resolution diffraction imaging with monochromatic synchrotron radiation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dobbyn, R. C. Larson, D. Brown, M. Steiner, B. Kuriyama, M. Laor, U. |
| Copyright Year | 1988 |
| Description | Novel, streak-like disruption features restricted to the plane of diffraction have recently been observed in images obtained by synchrotron radiation diffraction from undoped, semi-insulating gallium arsenide crystals. These features were identified as ensembles of very thin platelets or interfaces lying in (110) planes, and a structural model consisting of antiphase domain boundaries was proposed. We report here the other principal features observed in high resolution monochromatic synchrotron radiation diffraction images: (quasi) cellular structure; linear, very low-angle subgrain boundaries in (110) directions, and surface stripes in a (110) direction. In addition, we report systematic differences in the acceptance angle for images involving various diffraction vectors. When these observations are considered together, a unifying picture emerges. The presence of ensembles of thin (110) antiphase platelet regions or boundaries is generally consistent not only with the streak-like diffraction features but with the other features reported here as well. For the formation of such regions we propose two mechanisms, operating in parallel, that appear to be consistent with the various defect features observed by a variety of techniques. |
| File Size | 28329031 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890002224 |
| Archival Resource Key | ark:/13960/t48q0x40k |
| Language | English |
| Publisher Date | 1988-01-01 |
| Access Restriction | Open |
| Subject Keyword | Solid-state Physics Grain Boundaries Interfaces Domains Gallium Arsenides High Resolution Additives Crystal Defects Diffraction Monochromatic Radiation Imagery Synchrotron Radiation Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
