The PTCR Performance of Nb-Doped BaTiO₃-NBT Ceramics

Abstract:

In this paper, Nb-doped BaTiO₃-(Na_0.5Bi_0.5)TiO₃ (BBNT-Nb) based PTCR ceramic material has been prepared using high purity Nb₂O₅, Bi₂O₃, Na₂CO_3, TiO₂ and BaTiO₃ powders as starting materials, and its structural and electrical properties are investigated. The results indicated that the Nb₂O₅ dopant is helpful not only to promote the formation of tetragonal BBNT structure without any second phase, but also to decrease the room-temperature resistivity. For the 0.10at% Nb-doped BBNT material with BNT content 35mol%, the properties of room-temperature resistance of 10⁴Ω·cm, temperature coefficient (α_k) of 6.3%/°C, PTCR anomaly lg(R_max/Rmin) of 3.6 and Curie temperature (Tc) of 193°C are obtained.

• Periodical: Advanced Materials Research (Volumes 299-300)
• Pages: 512-515
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.299-300.512
• Online since: July 2011
• Authors: Li Zhe Li, Xing Wen Zhu, Tie Zhu Xu, Min Gong, Wen Zhong Jiang, Xiao Zhou
• Keywords: High Curie Temperature, BBNT, Lead-Free PTCR, Nb-Doped

References

[1] E. Brzozowski, M.S. Castro and J. Eur. Ceram: Soc. Vol. 20 (2000), p.2347.

[2] P. Yongping, J. Wei, Y. Mao and J. Wang: J. Alloys Compd. L5 (2010), p.498.

[3] Wang D Y, Li K, Chan H L W: Applied Physics A: Materials Science and Processing Vol. 80( 2005), p.1531.

[4] Gomah-Pettry, Jean-Richard, Said, Senda, Marchet, Pascal and Mercurio Jean-Pierre: Journal of the European Ceramic Society Vol. 24(2004), p.1165.

[5] Hiroaki Takeda, Wataru Aoto and Tadashi Shiosaki: Applied Physics LettersVol. 87(2005), p.102.

[6] Ping-Hua X, H. Takeda and T. Shiosaki: Applied Physics Letters Vol. 91(2007), p.162904.

[7] T. Shimada, K. Touji, Y. Katsuyama, H. Takeda and T. Shiosaki: Journal of the European Ceramic SocietyVol. 27(2007), p.3877.

DOI: 10.1016/j.jeurceramsoc.2007.02.171