Abstract
The electrical and microstructural properties of SnO 2-based varistors with the addition of 0.025 and 0.050 mol% of Fe 2O 3 have been characterised. Electric field ( E) versus current density ( J) curves showed that the effect of Fe 2O 3 addition is to increase both the non-linear coefficient and the breakdown voltage. Variations in the potential barrier height were inferred from impedance spectroscopy (IS) analysis. Through transmission electron microscopy (TEM), the presence of precipitates of secondary phases was confirmed. Samples with precipitates displayed poor electrical properties.
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