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无机材料学报

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Nb2O5掺杂高温无铅(Ba,Bi,Na)TiO3基PTCR陶瓷结构与电性能研究

李燕燕1,2, 李国荣1, 王天宝1, 郑嘹赢1, 冷森林1,2, 殷庆瑞1   

  1. 1.中国科学院 上海硅酸研究所， 上海 200050； 2.中国科学院 研究生院， 北京 100049
  • 收稿日期:2008-05-21 修回日期:2008-09-04 出版日期:2009-03-20 网络出版日期:2009-03-20

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

LI Yan-Yan1,2, LI Guo-Rong1, WANG Tian-Bao1, ZHENG Liao-Ying1, LENG Sen-Lin1,2, YIN Qing-Rui1   

  1. 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:2008-05-21 Revised:2008-09-04 Published:2009-03-20 Online:2009-03-20

PDF (PC)

2089

被引次数

3

摘要： 采用固相反应法制备了施主掺杂浓度不同的Nb2O5（分别为0.1mol%、 0.3mol%、 0.5mol%、 0.7mol%）掺杂(Ba, Bi,Na)TiO3基PTCR陶瓷. 对其微观结构及电性能进行研究发现：随着Nb2O5掺杂浓度的增加，陶瓷晶粒尺寸先变大后变小，室温电阻率也随之先减小后增大，说明Nb2O5的掺杂量存在一个临界施主掺杂浓度. 当Nb2O5施主掺杂量为临界施主掺杂浓度0.5mol%时，获得了居里温度Tc为 183℃、室温电阻率ρ为1.06×103Ω·cm、升阻比ρmax/ρmin为1.0×104的高温无铅PTCR陶瓷. 通过交流复阻抗谱分析，探讨了Nb2O5施主掺杂在该PTCR陶瓷中的作用机理.

关键词: PTCR, 无铅, 高居里温度, Bi1/2Na1/2TiO3

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

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