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.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry