Abstract
A new varistor system based on terbium oxide is introduced in this paper. The ceramic samples were prepared using the standard ceramic method and sintered in air at 1300 °C for 2 h. From the I–V measurements, the samples exhibit varistor action with the nonlinear coefficient α = 3.9 and the breakdown voltage Eb = 40 V mm−1 and possess excellent electrical stability up to 70 °C. X-ray diffraction reveals that the ceramic is a single phase structure. It is proposed that the varistor action can be attributed to the adsorbed oxygen on the grain surfaces. This is on the basis of the barrier formation model for metal oxide varistor systems and the intrinsic characteristics of terbium oxide ceramic.
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