ZnO-Pr₆O₁₁-Co₃O₄-TiO₂-Based Ceramic Varistor Materials

Abstract:

The preparation and characterization of ZnO-Pr6O11-Co3O4-TiO2 (ZPCT) based varistor materials with different doping levels of TiO2 and Pr6O11 were investigated. The results reveal that: (1) TiO2 is an important additive, acting as an inhibitor of ZnO grain growth. The doping of appropriate amount of TiO2 can significantly improve the nonlinear properties and decreases the leakage current of the varistors, achieving a relatively high nonlinear exponent and low leakage current with 1.0 mol% TiO2 doped. (2) The oxide of Pr6O11 microstructurally plays the role of inhibition in grain growth. The doping of appropriate amount of Pr6O11 can improve the nonlinear property, and decrease the leakage currents of the varistors, acquiring the optimum results with 1.5 mol% Pr6O11 doped.

• Periodical: Key Engineering Materials (Volumes 434-435)
• Pages: 389-392
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.434-435.389
• Online since: March 2010
• Authors: Hai Feng, Zhi Jian Peng, Cheng Biao Wang, Zhi Qiang Fu, He Zhuo Miao
• Keywords: Electrical Properties, Pr₆O₁₁, TiO₂, ZnO Varistor

References

[1] T.K. Gupta: J. Am. Ceram. Soc. Vol. 73.

[7] (1990), p.1817.

[2] S. Fujitsu, H. Toyoda and H. Yanagida: Commn. Am. Ceram. Soc. Vol. 70.

[4] (1987), p. c-71.

[3] Y.S. Lee, and T.Y. Tseng: J. Am. Ceram. Soc. Vol. 75 (1992), p.1636.

[4] C.W. Nahm: Mater. Lett. Vol. 57 (2003), p.1317.

[5] S. Bernik, P. Zupancic and D. Kolar: J Euro Ceram Soc Vol. 19 (1999), p.709.

[6] A. Peigney, H. Andrianjatovo, R. Legros, et al: J. Mater. Sci. Vol. 27 (1992), p.2397.

[7] H.H. Hng and K.M. Knowles: J. Mater. Sci. Vol. 37 (2002), p.1143.

[8] B.S. Skidan and M.M. M'int: Glass and Ceramics. Vol. 64 (2007), p.31.

[9] C.W. Nahm, B.C. Shin and B.H. Min: Mater. Chem. Phys. Vol. 82 (2003), p.157.