Grain growth control in ZnO varistors using seed grains
- 1 February 1983
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 54 (2) , 1095-1099
- https://doi.org/10.1063/1.332124
Abstract
A method for making low‐voltage ZnO varistors having extraordinarily large grain size without necessity of sintering at much higher temperatures or for much longer times is reported. The device is made by sintering a mixture of ZnO fine powder, additives, and ZnO seed grains having grain sizes of 63–105 μm obtained by washing a ZnO sintered body containing BaO in boiling water. The device has a grain size around 500 μm and low threshold voltage of 6 V/mm. Such anomalous grain growth is caused by the difference between the radii of curvature of ZnO fine powder and ZnO seed grains.This publication has 4 references indexed in Scilit:
- Sintering and varistor characteristics of ZnO-Bi2O3 ceramicsJournal of Applied Physics, 1980
- Formation Mechanism of Nonohmic Zinc Oxide CeramicsJapanese Journal of Applied Physics, 1980
- Low voltage ZnO varistor: Device process and defect modelJournal of Applied Physics, 1980
- Nonohmic Properties of Zinc Oxide CeramicsJapanese Journal of Applied Physics, 1971