Bi2O3-ZnO Varistors

Abstract

Zinc oxide varistors are the devices used to protect the electric devices from voltage surges and voltage transients. These devices can be found not only in the small appliances such as mobile phones, televisions, microwaves, etc but also at the power station. The highly nonlinear current-voltage (non ohmic) characteristics are the most important electrical property of this device. This property relates to the grain boundary. Furthermore, the dopants lead the various electrical properties such as aluminium improves the nonlinear behavior, silver improves the stability of materials, etc.