The Role of Interfacial Microstructure in ZnO Varistor Materials
The influence of sintering parameters (e. g. time and cooling rate) on the inter granular microstructure of a ZnO varistor material has been investigated and related to leakage currents. It is considered that the three dimensional network ofBi-rich phases which exists at multiple grain junctions provides an alternative conduction path through the material. This path becomes important at voltages below the break down.
KeywordsCool Rate Sinter Temperature Leakage Current Triple Junction Dimensional Network
Unable to display preview. Download preview PDF.
- 2.L.M. Levinson, H.R. Philipp, E. Sonder, “Interface effects in zinc oxide varistors”, these proceedings, p. 673.Google Scholar
- 4.R. Einzinger, “Grain junction properties of ZnO varistors”, Appl. Surf. Sci., 3; 390Google Scholar
- 6.W.D. Kingery, “The distribution and influence of minor constituents on ceramic formulations”, these proceedings, p. 281.Google Scholar
- 7.D.R. Clarke, “Wetting and dewetting of grain boundaries in polyphase ceramics”, these proceedings, p. 269.Google Scholar