Varistor action in zinc oxide suspension

Negita, K.; Yamaguchi, T.; Tsuchie, T.; Shigematsu, N.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2844
Academic Journal
In a suspension composed of zinc oxide (ZnO) particles and silicone oil, it is found that the current density dramatically increases above a specific electric field (break down field (E[SUBb]). In ac measurement, the nonlinear coefficient (α), which characterizes the relationship between current density J and the electric field E as J ∞ Eα, changes from ∼1 to ∼30 when increasing the electric field through E[SUBb]. On the basis of the α value, temperature dependence of E[SUBb], etc., the mechanism of the fluid varistor is briefly discussed.


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