Abstract
In view of the controversy surrounding the crystal symmetry of spinels, an aluminium oxynitride phase reported to be based on the spinel structure has been investigated using convergent beam electron diffraction (CBED) and computer simulation. A variety of CBED point and space group determination methods have been utilized in search of possible non-centrosymmetry which reduces the space group symmetry from Fd3m to F43m. The occurrence of Gjønnes-Moodie (GM) lines in the debated {2 0 0} reflections is also explored through careful voltage variation experiments. The detailed analyses clearly show that the point group of this spinel is the centrosymmetric m3m and that the space group is Fd3m.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 417-434 |
| Number of pages | 18 |
| Journal | Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties |
| Volume | 61 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 1990 |
Funding
The authors would like to thank the following funding organizations for their financial support: DOE grant DE-FG02-84ER45150 (V. Dravid, M. Notis, and C. Lyman), NSF grant DMR-8023955 (J. Sutliffand M.N otis), and the Semiconductor Research Corporation (A. Westwood and M. Notis). We would also like to thank Professor D. B. Williams and Dr D. R. Liu for providing access to their results on TiBe, prior to publication.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Materials Science
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
- Metals and Alloys