The GB parameters, including the donor concentration (N d ), showed an increasing trend in the range of (3.33–7.64) × 10 17 cm −3 with increasing sintering temperature due to ZnO dissociation.
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Effects of Dopants and Processing Parameters on the Properties of ZnO-V<sub>2</sub>O<sub>5</sub>-Based Varistors Prepared by Powder Metallurgy: A Review.
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