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International audienceThe kinetics of reduction of zinc oxide-based varistors has been studied at 650°C in CO-CO2 mixtures in order to correlate ageing under electrical stress to diffusion phenomena. The experimental results indicate that the main cause of the ageing is a migration of oxygen from the outer core of the ZnO grains toward the intergranular phases

INFLUENCE OF THE DIFFUSION OF OXYGEN ON THE AGING OF ZINC OXIDE-BASED VARISTORS