The microstructural location of the intergranular metal-oxide phase in a zinc oxide varistor

This is the authors' abstract. We don't add key points for this paper.

High-resolution electron microscopy of a commerical ZnO-based varistor reveals that the Bi-rich intergranular phase is found at all three- and four-grain junctions and that the majority of the ZnO grains are not surrounded by an oxide-barrier film as previously believed.