Abstract
High-resolution electron microscopy (HREM) images of niobium-doped tungsten trioxide show small spot contrasts and walls of apparently empty sites, in addition to a fascinating range of extended defects involving crystallographic shear, pentagonal column and combination precipitation phenomena. The precipitation of crystallographic shear defects in situ and the appearance of metal-rich surface layers are described. Computer simulations of pentagonal columns and of small-defect contrast are used to test the validity of oxygen-vacancy and interstitial-defect models, and to support the interpretation of more complex defect structures.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 227-237 |
| Number of pages | 11 |
| Journal | Proceedings of The Royal Society of London, Series A: Mathematical and Physical Sciences |
| Volume | 415 |
| Issue number | 1848 |
| State | Published - Jan 8 1988 |
| Externally published | Yes |
ASJC Scopus subject areas
- Engineering(all)