Abstract
ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm-1) compared with the commercial samples (723 ±30 V mm-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.
Original language | English |
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Pages (from-to) | 158-160 |
Number of pages | 3 |
Journal | Advances in Applied Ceramics |
Volume | 105 |
Issue number | 3 |
DOIs | |
Publication status | Published - Jun 2006 |
Keywords
- Dopants
- Grain growth
- Nano
- Sintering
- Varistors
- ZnO