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Varistor behavior shows significant differences when the addition levels of different dopants like In2O3, Cr2O3, and Al2O3 are changed, thus stimulating current investigations on the SnO2–Co3O4–Ta2O5 ceramic system. In this contribution, the influence of high additions of Al2O3 on the microstructure, structure and the electrical properties of SnO2–Co3O4–Ta2O5 varistors ([98.95-X]%SnO2–1% Co3O4–X%...