Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1295681 | Solid State Ionics | 2006 | 10 Pages |
Abstract
The electrical properties, microstructures and phase content of a ZnO–CoO–Bi2O3 varistor have been characterised. High-resolution TEM and selected area electron diffraction provided detailed information on the distribution and structure of the intergranular Bi-rich phase. Triple points between the ZnO matrix grains contained crystallites that could be indexed to tetragonal β-Bi2O3, cubic γ-Bi2O3 and δ-Bi2O3, or corresponding isostructural ZnO-Bi2O3 phases. Thin-film, 1–2 nm grain boundaries were found to be amorphous, but for the first time, crystalline precipitates (with the β-Bi2O3 type structure) were also detected in some thicker, 4–5 nm films.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
W. Onreabroy, N. Sirikulrat, A.P. Brown, C. Hammond, S.J. Milne,