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000000228 037__ $$aENY-ARTICLE-2008-178
000000228 041__ $$aeng
000000228 100__ $$aJaroszewski, M$$uWrocław University of Technology
000000228 245__ $$aCapacitance Changes in Degraded Metal Oxide Varistors
000000228 260__ $$c2004-07-05
000000228 500__ $$a2004 International Conference on Solid Dielectrics, Toulouse, France, July 5-9, 2004
000000228 520__ $$aZnO based ceramics show a highly nonlinear current-voltage (I-V) characteristic due to intergranular layers at the boundaries of ZnO grains. This research indicates that the junctions formed on the border between ZnO grains and the intergranular phase are responsible for the creation of potential barriers which control the flow of current through the bulk of such a ceramic. Having polycrystalline nature and a large number of intergranular barriers, and so a high energy absorption capability, ZnO ceramics are used as active components in overvoltage protection devices. But as a result of charge transport the height of the barriers decreases and varistor degradation occurs. The degradation seems to affect mainly the prebreakdown region of the I-V curve and it results in increased leakage current. This paper presents a part of research aimed at assessing the effect of ageing on the capacitance characteristic of ZnO varistors.
000000228 6531_ $$avaristor
000000228 6531_ $$aZnO
000000228 6531_ $$adegradation
000000228 700__ $$aWieczorek, K$$uWrocław University of Technology
000000228 700__ $$aBretuj, W$$uWrocław University of Technology
000000228 700__ $$aKostyla, P$$uWrocław University of Technology
000000228 8560_ $$fmaciej.jaroszewski@pwr.wroc.pl
000000228 8564_ $$uhttp://zet10.ipee.pwr.wroc.pl/record/228/files/$$zAccess to Fulltext
000000228 909CO $$ooai:zet10.pwr.wroc.pl:228$$pglobal
000000228 980__ $$aARTICLE