Abstract

A study of the effect of uniaxial pressure on the I-V response of zinc oxide varistors has shown a pressure sensitivity in both prebreakdown and breakdown regions. The general observation is that the conductivity increases with pressure, the effect being more pronounced in the prebreakdown region. Data are in general agreement with the phenomenological model given by Schwertz and Mazenko. Data are also treated on the basis of Schottky barrier and tunneling theories. According to this analysis, the barrier height is found to decrease with pressure.

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