Journal of Materials Science

, Volume 38, Issue 5, pp 1033–1038 | Cite as

Effect of dopant valence state of Mn-ions on the microstructures and nonlinear properties of microwave sintered ZnO-V2O5 Varistors

  • Chang-Shun Chen


In this study, the effect of dopant valence state of Mn-species on the microstructure and conduction behavior of microwave sintered ZnO-V2O5 ceramics was analyzed. Microwave sintering can markedly enhance the densification rate of ZnO-V2O5 ceramics, regardless the valence state of Mn-species incorporated. But only the samples doped with low valences Mn-ions (Mn2+ or Mn2.66+) exhibit large nonlinear coefficient (α = 21.9) with low leakage current density, whereas the ZnO-V2O5 ceramics added with high valence Mn-ions (Mn4+) show inferior nonohmic behaviors with high leakage current density under the same sintering conditions. Restated, the valence state of Mn-species incorporated in ZnO-V2O5 ceramics, insignificantly alters the grain growth behavior but markedly modifies their nonlinear electrical properties.


Microstructure Microwave Valence State Growth Behavior Nonlinear Property 
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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Chang-Shun Chen
    • 1
  1. 1.Department of Mechanical EngineeringHwa-Hsia College of Technology and Commerce, Taipei 235TaiwanROC

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