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- W1993371808 abstract "0.935Ba<TEX>$TiO_3$</TEX>-0.065(<TEX>$Bi_{0.5}Na_{0.5}$</TEX>)<TEX>$TiO_3+xmol%MnO_2$</TEX> (BBNTM-x) ceramics with <TEX>$0{leq}x{leq}0.05$</TEX> were fabricated with muffled sintering by a modified synthesis process. Their microstructure and enhanced positive temperature coefficient of resistivity (PTCR) characteristics were systematically investigated in order to obtain lead-free high TC PTCR thermistors. All specimens showed a perovskite structure with a tetragonal symmetry and no secondary phase was observed. Grain growth was achieved when the doped MnO2 was increased above 0.02 mol%. This is due to the effect of positive Mn ion doping as an acceptor compensating a Ba vacancy occurred by the higher donor dopant concentration of <TEX>$Bi^{3+}$</TEX> ion. Especially, enhanced PTCR characteristics of the extremely low <TEX>${rho}_{RT}$</TEX> of <TEX>$9;{Omega}{cdot}cm$</TEX>, PTCR jump of <TEX>$5.1{times}10^3$</TEX>, <TEX>${alpha}$</TEX> of 15.5%/<TEX>$^{circ}C$</TEX> and high <TEX>$T_C$</TEX> of <TEX>$167^{circ}C$</TEX> were achieved for the BBNTM-0.04 ceramics." @default.
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- W1993371808 date "2011-09-01" @default.
- W1993371808 modified "2023-10-01" @default.
- W1993371808 title "Enhancement of PTCR Characteristics of MnO2Doped Lead Free BaTiO3-(Bi0.5Na0.5)TiO3Ceramics with High Tc(>165℃)" @default.
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- W1993371808 doi "https://doi.org/10.4313/jkem.2011.24.9.723" @default.
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