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http://dx.doi.org/10.4313/JKEM.2010.23.12.929

Investigation on PTCR Characteristics of (1-x)BaTiO3-x(Bi0.5Na0.5)TiO3 (0.01≤x≤0.10) Ceramics by Modified Synthesis Process  

Kim, Kyoung-Bum (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Kim, Chang-Il (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Jeong, Young-Hun (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Lee, Young-Jin (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Paik, Jong-Hoo (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology)
Lee, Woo-Young (HIEL Corporation)
Kim, Dae-Joon (HIEL Corporation)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.23, no.12, 2010 , pp. 929-935 More about this Journal
Abstract
$(1-x)BaTiO_3-x(Bi_{0.5}Na_{0.5})TiO_3$ ($0.01{\leq}x{\leq}0.10$) ceramics were fabricated with muffled sintering by a modified synthesis process. Their positive temperature coefficient of resistivity (PTCR) characteristics were investigated systematically. All specimen showed a perovskite structure with a tetragonal symmetry. Both the lattice parameter of a and c axes were slightly decreased with increasing $(Bi_{0.5}Na_{0.5})TiO_3$ (BNT) content. Grain growth was achieved when the incorporated BNT was increased to 6 mol% and the inhibition of grain growth is considered to be due to the appearance of Ba vacancy ($V^{"}_{Ba}$) in the $(1-x)BaTiO_3-x(Bi_{0.5}Na_{0.5})TiO_3$ ($0.08{\leq}x$). With 4 mol% BNT addition, room temperature resistivity decreased to $48 \Omega{\cdot}cm$ and a resistivity jump ($\rho_{max}/\rho_{min}$) was as high as $1.1{\times}10^4$, respectively. Curie temperature was also increased to $171^{\circ}C$ with increasing BNT content.
Keywords
PTCR; Lead-free; $(Bi_{0.5}Na_{0.5})TiO_3$; Thermistor; Modified synthesis;
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