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Journal of Materials Science

, Volume 42, Issue 8, pp 2637–2642 | Cite as

Microstructure and electrical properties of ZnO-based varistors prepared by high-energy ball milling

  • Hong-Yu Liu
  • Hui Kong
  • Xue-Ming MaEmail author
  • Wang-Zhou Shi
Article

Abstract

ZnO-based varistor ceramics were prepared at sintering temperatures ranging from 900 °C to 1,300 °C, by subjecting the mixed oxide powders to high-energy ball milling (HEBM) for 0, 5, 10 and 20 h, respectively. Varistor ceramics prepared by HEBM featured denser body, better electrical properties sintered at low-temperature than at traditional high-temperature. The high density is due to the refinement of the crystalline grains, the enhanced stored energy in the powders coming from lattice distortion and defects as well as the promotion of liquid-phase sintering. Good electrical properties is attributed to proper microstructure formed at low-temperature and improved grain boundary characteristics resulting from HEBM. With increasing sintering temperatures, the electrical properties and density became worse due to the decrease in amount of Bi-rich phase. Temperature increased up to 1,200 °C or above, the Bi-rich phase vanished and the ceramics exhibited very low nonlinear coefficient.

Keywords

Bi2O3 Sb2O3 Milled Sample Increase Sinter Temperature Varistor Ceramic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant No.50471045) and Shanghai Nano-technology Promotion Center (Grant No.0452nm026).

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Hong-Yu Liu
    • 1
  • Hui Kong
    • 1
  • Xue-Ming Ma
    • 1
    • 2
    Email author
  • Wang-Zhou Shi
    • 1
  1. 1.Department of PhysicsEast China Normal UniversityShanghaiChina
  2. 2.Key Laboratory of Optical and Magnetic Resonance Spectroscopy of Ministry of EducationShanghaiChina

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