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The present investigation reports the variations of the microstructure and electrical properties due to a change in the ZnSb2O6 content of ZnO varistors. The impact of the ZnSb2O6 additive on both microstructure and electrical properties in ZnO varistors is studied via the X‐ray diffraction (XRD) and an impedance analyzer. Zn7Sb2O12 spinel phase and single hexagonal ZnO phase are detected in ZnO varistors...