Electrical Properties of Nb-Doped and Nb-Mn-Codoped BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-Free PTCR Ceramics

Abstract:

Nb-doped and Nb-Mn-codoped (1-xmol%)BaTiO3-xmol%(Bi0.5Na0.5)TiO3 (BBNTx) lead-free positive temperature coefficient of resistivity (PTCR) ceramics were prepared by the conventional solid state reaction method. The XRD patterns indicated that all BBNTx samples formed a single perovskite structure with tetragonal phase. 0.25 mol% Nb doped BBNT1 ceramic, sintered at 1330°C for 1h in air, had low room-temperature resistivity (ρ25) of 80 Ω•cm and a high resistivity jump (maximum resistivity [ρmax]/minimum resistivity [ρmin]) of 4.2 orders of magnitude with Tc about 152°C. The Nb-doped BBNTx (10≤x≤60) ceramics also showed distinct PTC effect with Tc between 185 and 232°C by sintering in N2, which was shut off when samples were cooled to a low temperature. In addition, The Nb-Mn-codoped BBNT1 ceramics exhibited higher resistivity jump than the single Nb-doped ones, with increasing the room-temperature resistivity.

• Periodical: Advances in Science and Technology (Volume 67)
• Pages: 134-142
• DOI: https://doi.org/10.4028/www.scientific.net/AST.67.134
• Online since: October 2010
• Authors: Guo Rong Li, Sen Lin Leng, Liao Ying Zheng, Jiang Tao Zeng, Zhi Jun Xu, Rui Qing Chu
• Keywords: (Bi_0.5Na_0.5)TiO₃, BaTiO₃, Electrical Properties, PTCR

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