Effect of Li⁺ and Mn²⁺ Doping on the Electrical Properties of SrTiO₃-Based Varistor Ceramics

Abstract:

Effect of Li+ and Mn2+ doping on the electrical properties of SrTiO3-based varistor ceramics was investigated. The results showed that the varistor ceramics cannot possess ideal electrical properties when only Li+ or Mn2+ was doped. However, when Li+ and Mn2+ were properly doped together, the samples acquired excellent electrical properties: V1mA = (5.7 ~ 11.7)V/mm; α = 6.8 ~ 11.0; er = (2.4 ~ 4.4) × 105; tan d = (7.1 ~ 10.4)%. When the contents of Li2CO3 and MnCO3 were 1.00 mol% and 0.05 mol% respectively, the nonlinear coefficient α reached the largest value of 11.0. Compared with only Mn2+ doping, the addition of Li+ increases the α value significantly.

• Periodical: Key Engineering Materials (Volumes 280-283)
• Pages: 361-364
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.280-283.361
• Online since: February 2007
• Authors: Yu Xing Xu, Zhong Tai Zhang, Xin Yue Zhang, Zi Long Tang, Shao Hua Luo, Li Min Dong
• Keywords: Electrical Properties, Li⁺ Doping, Mn²⁺ Doping, SrTiO₃-Based Varistor Ceramics

References

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

[2] N. Yamaka, M. Masuyama and M. Fukui: Am. Ceram. Bull. Vol. 62 (1983), p.698.

[3] H. Okinaka and T. Hata: Am. Ceram. Bull. Vol. 74 (1995), p.62.

[4] S.Y. Chung, D.Y. Yoon and S.J.L. Kang: Acta Mater. Vol. 50 (2002), p.3361.

[5] S.H. Kim, J.G. Park, Y. Kim and D.Y. Kim: J. Mater. Sci. Lett. Vol. 19 (2000), pp. (1955).

[6] M. Kowabara, H. Matsuda and Y. Ohba: J. Mater. Sci. Vol. 34 (1999), p.2635.

[7] S.B. Desu and D. A. Payne: J. Am. Ceram. Soc. Vol. 73 (1990), p.3391.

[8] V. Ravikumar, R. P. Rodrigues and V. P. Dravid, J. Phys. Appl. Phys. Vol. 29 (1990), p.1799.

[9] M. J. Akhtar, Z.U.N. Akhtar, R.A. Jackson and C.R.A. Catlow: J. Am. Ceram. Soc. Vol. 78 (1995), p.421.