Inner Electrodes for Multilayer Varistors

摘要

In the present study, Ptor AgPd metal is used as the inner electrode for Bi_2O_3-doped ZnO multilayer varistors (MLV). The growth of the ZnO grains is constrained by the presence of the inner electrodes. The Pt inner electrodes are chemically inert to Bi_2O_3-doped ZnO. The Bi_2O_3 could react with Pd to form PdBi_2O_4. The Bi_2O_3-rich liquid also tends to wet the AgPd electrode. The size of ZnO grains in the MLV/AgPd specimen is larger. The ZnO grains in the MLV/AgPd specimen can even grow to a size larger than the layer thickness at the expense of electrode continuity.