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The microstructure and positive temperature coefficient of resistivity (PTCR) characteristics of 0.1 mol% doped (BBNT-NT001) ceramics sintered at various temperatures from to were investigated in order to develop eco-friendly PTCR thermistors with a high Curie temperature (). Resulting thermistors showed a perovskite structure with a tetragonal symmetry. When sintered at , the specimen had a uniform microstructure with small grains. However, abnormally grown grains started to appear at and a homogeneous microstructure with large grains was exhibited when the sintering temperature reached . When the temperature exceeded , the grain growth was inhibited due to the numerous nucleation sites generated at the extremely high temperature. It is considered that is responsible for the grain growth of the ) ceramics by forming a liquid phase during the sintering at around . The grain growth of the BBNT-NT001 ceramics was significantly correlated with a decrease of resistivity. All the specimens were observed to have PTCR characteristics except for the sample sintered at . The BBNT-NT001 ceramics had significantly decreased and increased resistivity jump with increasing sintering temperature at from to . Especially, the BBNT-NT001 ceramics sintered at exhibited superior PTCR characteristics of low resistivity at room temperature (), high resistivity jump (), high resistivity temperature factor (20.4%/), and a high Tc of .

Microstructure and Positive Temperature Coefficient of Resistivity Characteristics of Na2Ti6O13-Doped 0.94BaTiO3-0.06(Bi0.5Na0.5)TiO3 Ceramics