Properties and intergranular phase analysis of a ZnO–CoO–Bi2O3 varistor |
| |
| Institution: | 1. Department of Chemistry, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo 156-8550, Japan;2. Department of Physics, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo 156-8550, Japan;1. Linköping University, Department of Physics, Chemistry, and Biology (IFM), 583 81 Linköping, Sweden;2. Frantsevich Institute for Problems of Materials Science NAS of Ukraine, 3 Krzhizhanivsky str., 03680 Kyiv, Ukraine |
| |
| 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: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
