Enhanced PTCR characteristics of 0.95BaTiO 3 -0.05(Bi 0.5 Na 0.5 )TiO 3 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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Abstract

0.95BaTiO 3 -0.05(Bi 0.5 Na 0.5 ) 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 (Bi 0.5 Na 0.5 ) TiO 3 -rich BaTi O 3 (Bi 0.5 Na 0.5 ) Ti O 3 intermediate composition in the additional step. For the specimen with the intermediate step composition of 0.94 (Bi 0.5 Na 0.5 ) Ti O 3 -0.06BaTi O 3 , 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× 10 4 , temperature coefficient of resistivity of 41%/°C, and low resistivity at room temperature of 1.6× 10 2 cm caused by its large grain boundary volume compared to the specimen fabricated by the normal synthesis process.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number2
DOIs
Publication statusPublished - 2011 Jan 5

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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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