Influence of MCO3 (M=Ca, Sr, Ba)-doping on the non-ohmic properties of the ceramic varistor system SnO2–Co3O4–Cr2O3–Nb2O5

The ceramic varistors SnO2–Co3O4–Nb2O5–Cr2O3 with the addition of CaCO3, SrCO3 or BaCO3 were sintered at temperatures 1250 and 1350°C, then their structures and electrical properties were studied. In all samples, the SnO2 cassiterite phase with a rutile-type structure and the Co2SnO4 phase with a spinel-type structure were observed. All materials exhibited a highly nonlinear dependence of the current density on the electric field with the nonlinearity coefficient 24–50. When alkaline earth metal carbonates were added, the grain size of all samples decreased and the electric field E1 increased. The addition of CaCO3 lead to the decrease of the low-field electrical conductivity of varistors. The lowest low-field conductivities 4·10–13 and 6·10–13 Ω–1 cm–1 were found in the samples with CaCO3 addition baked at 1250 and 1350°C, respectively. The observed effect is due to the increase of the potential barrier height at the SnO2 grain boundaries by 7 and 13%, respectively, and the decrease of the grain size by 26 and 28% compared to SnO2-based varistor ceramics without CaCO3 addition.

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Influence of MCO3 (M=Ca, Sr, Ba)-doping on the non-ohmic properties of the ceramic varistor system SnO2–Co3O4–Cr2O3–Nb2O5

Cited by 3 publications

References 30 publications

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Influence of V2O5, Nb2O5, Sb2O5 and Ta2O5 on microstructure and non-ohmic electrical properties of SnO2-based systems

Effect of CaCO₃, SrCO₃ and BaCO₃ additions on the microstructure and electrical characteristics of SnO₂-based varistor ceramics

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Influence of MCO3 (M=Ca, Sr, Ba)-doping on the non-ohmic properties of the ceramic varistor system SnO2–Co3O4–Cr2O3–Nb2O5

Cited by 3 publications

References 30 publications

Impact of the particle size on the non-Ohmic properties of doped ZnO ceramic varistor materials synthesized via mechanosynthesis

Impact of the particle size on the non-Ohmic properties of doped ZnO ceramic varistor materials synthesized via mechanosynthesis

Influence of V2O5, Nb2O5, Sb2O5 and Ta2O5 on microstructure and non-ohmic electrical properties of SnO2-based systems

Effect of CaCO3, SrCO3 and BaCO3 additions on the microstructure and electrical characteristics of SnO2-based varistor ceramics

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Effect of CaCO₃, SrCO₃ and BaCO₃ additions on the microstructure and electrical characteristics of SnO₂-based varistor ceramics