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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 2: 374 - 378

DOI: https://doi.org/10.3724/SP.J.1077.2009.00374

Research Paper

Effects of NiobiumDoping on the Structure and Electrical Properties of (Ba,Bi,Na)TiO3-based PTCR Ceramics

  • LI Yan-Yan ,
  • LI Guo-Rong ,
  • WANG Tian-Bao ,
  • ZHENG Liao-Ying ,
  • LENG Sen-Lin ,
  • YIN Qing-Rui
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  • 1.Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2.Graduate University of the Chinese Academy of Sciences，Beijing 100049, China

Received date: 2008-05-21

  Revised date: 2008-09-04

  Online published: 2009-03-20

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Abstract

(Ba, Bi, Na)TiO3-based PTCR Ceramics (BBNMT) doped with Nb2O5 (0.1mol%, 0.3 mol%, 0.5mol%, 0.7mol%) were prepared by the solid state reaction method and annealing in the reduction atmosphere. The microstructures and electrical properties of BBNMT were investigated. The results show that with the increase of Nb2O5 contents, the grain size increases firstly and then decreases, which indicates that there exists an optimal content of Nb2O5. The low resistivity PTC ceramic materials are obtained when the content of Nb2O5 is 0.5mol% with the room temperature resistivity(ρ25) of 1.06×103Ω·cm, the Curie temperature (Tc) of 183℃, and the resistivity jump (ρmax/ρmin) of 1.0×104. By analyzing the impedance spectroscopy, the influence of the grain phase, grain boundary phase and “shell phase” on the resistivity are discussed, the interaction mechanism of Nb2O5 donor in PTCR ceramics are also studied.

Key words： PTCR; lead-free; high curie temperature; (Bi1/2Na1/2) TiO3

Cite this article

LI Yan-Yan , LI Guo-Rong , WANG Tian-Bao , ZHENG Liao-Ying , LENG Sen-Lin , YIN Qing-Rui . Effects of NiobiumDoping on the Structure and Electrical Properties of (Ba,Bi,Na)TiO3-based PTCR Ceramics[J]. Journal of Inorganic Materials, 2009 , 24(2) : 374 -378 . DOI: 10.3724/SP.J.1077.2009.00374

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