Microstructure and Electrical Properties of MnO₂-Doped ZnO-Pr₆O₁₁-Based Varistor Ceramics

Abstract:

The effect of 0~1mol% MnO₂ doping on microstructure and electrical properties of the Zn–Pr–Co–Cr–Mn-based varistor ceramics was investigated by means of SEM, XRD and standard current-voltage property tests. The increase of MnO₂ doping level strongly decreased the relative density (99%-91.5%) by the effect of pining of Pr_0.96Mn_0.98 2O3. The nonlinear coefficient increased from 17.4 for MnO₂-undoped sample to 54 for MnO₂-doped sample up to 0.5 mol%, whereas the further doping resulted in decrease.

• Periodical: Advanced Materials Research (Volume 645)
• Pages: 116-120
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.645.116
• Online since: January 2013
• Authors: Xiao Xing Han, Si Chao Huang, Ying Liang, Yu Shi
• Keywords: MnO₂, Non-Linear Coefficient, Pr₆O₁₁, Varistor Ceramics, Zinc Oxide (ZnO)

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