Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15561
Title: Degradation of ZnO ceramic varistors induced by water and AC voltages
Authors: Chen, WP
Chan, HLW 
Issue Date: 2004
Source: Japanese journal of applied physics. Part 1, Regular papers and short notes 2004, v. 43, no. 2, p. 701-702
Abstract: ZnO-based ceramic Varistors were immersed in 0.01 M NaOH solution and 50 Hz AC voltages were applied between the electrodes of each varistor and a counter electrode in the solution. After the treatment, the leakage current of the Varistors was increased by more than two orders of magnitude while the switch voltage remained unchanged, and the dielectric loss was markedly increased in the low-frequency region. The degradation induced by water and AC voltages was similar to that induced by water and DC voltages, indicating that water-induced degradation is important for ZnO ceramic varistors regardless of whether they operate under DC or AC voltages.
Keywords: Degradation
Varistors
Water
Zinc oxide
Publisher: Institute of Pure and Applied Physics
Journal: Japanese journal of applied physics. Part 1, Regular papers and short notes 
ISSN: 0021-4922
EISSN: 1347-4065
DOI: 10.1143/JJAP.43.701
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