Enhanced PTCR characteristics of 0.95BaTiO3-0.05(Bi 0.5Na0.5)TiO3 ceramics fabricated by modified synthesis process

Young Hun Jeong, Chul Min Kim, Chang Il Kim, Yong Soo Cho, Young Jin Lee, Jong Hoo Paik, Wu Young Lee, Dae Jun Kim

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0.95BaTiO3-0.05(Bi0.5Na0.5) Ti O 3 ceramics with a positive temperature coefficient of resistivity (PTCR) were fabricated by a modified synthesis process. Their structural and PTCR characteristics were investigated by varying the (Bi0.5 Na 0.5) TiO3-rich BaTi O3 (Bi0.5 Na0.5) Ti O3 intermediate composition in the additional step. For the specimen with the intermediate step composition of 0.94 (Bi 0.5 Na0.5) Ti O3-0.06BaTi O3, abnormally large grains grew with the aid of the liquid phase that developed due to the volatile Bi during sintering at 1300°C. Especially, it showed enhanced PTCR characteristics with a PTCR jump of 1.1× 104, temperature coefficient of resistivity of 41%/°C, and low resistivity at room temperature of 1.6× 102cm caused by its large grain boundary volume compared to the specimen fabricated by the normal synthesis process.

Original languageEnglish
Pages (from-to)J27-J31
JournalJournal of the Electrochemical Society
Issue number2
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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