Abstract
The positive temperature coefficient of resistance (PTCR) characteristics of Na2Ti6O13 (NT)-doped 0.94BaTiO3–0.06(Bi0.5Na0.5)TiO3 (BBNT) ceramics were investigated in order to evaluate the effect of NT as a new additive for lead-free PTCR thermistor application. The BBNT ceramic sintered at 1325°C exhibited a relatively high Curie temperature (T C ) of 158°C while its PTCR characteristic was not satisfactory for thermistor application. However, doping with NT significantly influenced the PTCR behavior of BBNT ceramic. It is considered that NT was responsible for grain growth of the BBNT by forming a liquid phase during sintering due to its low melting temperature of 1300°C. The grain growth resulted in the enhanced PTCR characteristics of BBNT ceramic. In particular, 0.1 mol% NT doped BBNT ceramic exhibited excellent PTCR performance of low resistivity at room temperature (1.6×102 Ω cm), resistivity increase near T C (1.28×104) and high T C of 158°C, suitable for lead-free PTCR thermistor application.
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Acknowledgements
This study is supported by the Ministry of Knowledge Economy through the Program for Developing Original Technology of Industry and some authors also acknowledge that this work was financially supported by the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.
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Jeong, Y.H., Cha, YJ., Kim, CI. et al. Positive temperature coefficient of resistance effect in Na2Ti6O13-doped 0.94BaTiO3–0.06(Bi0.5Na0.5)TiO3 ceramics. Appl. Phys. A 106, 871–876 (2012). https://doi.org/10.1007/s00339-011-6700-x
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DOI: https://doi.org/10.1007/s00339-011-6700-x