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Varistors are devices that change the resistance with the voltage. This electroceramic materials protect equipment against voltage surges produced by lightning, trading, or electronic noise into the power lines of direct or alternating current. The principal oxides used to make varistors are ZnO, SnO2, and TiO2, but it is important to introduce dopants in the crystalline structure of these oxides to obtain the better electrical properties. In this work, we synthesized the raw material for varistors. We utilized the co-precipitation method for these. The ceramic powders were characterized with X-Ray diffraction (XRD), infrared spectroscopy (FTIR), and differential thermal analysis (DTA). The materials sinterized were characterized with scanning electronic microscopy (SEM), and besides, we measured the current and voltage curves of these devices.
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