Study on the Electrical Properties and the Ac Conductance Response of ZnO-Based Varistor

Xue Tong Zhao; Rui Jin Liao; Jian Ying Li

doi:10.4028/www.scientific.net/AMR.1070-1072.625

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Study on the Electrical Properties and the Ac Conductance Response of ZnO-Based Varistor

Abstract:

ZnO-based varistor ceramics with different recipes were prepared in this research. It was found that the grain growth was restrained with the addition of Ba²⁺. SEM results indicated that the grain size of ZnO varistor ceramics with Ba²⁺ was reduced to 4.7 μm. Correspondingly, the breakdown electric field of the ZnO varistor samples were extremely enhanced to 8730 V/cm. The results of ac conductance response showed that two relaxation peak 1 and 2 with activation energy at about 0.24 eV and 0.36 eV were observed in 100-250 K, which were not affected by additives. However, a new conductance relaxation peak 3 in 300-450 K for sample B and C can be found, whose activation energy were varied from 0.55 eV to 0.65 eV with the addition of Ba²⁺. It was put forward that the electrical properties of ZnO varistor ceramics may be associated with the conductance relaxation peak 3.