Abstract
Perovskite barium-strontium titanate, <TEX>$(Ba, Sr)TiO_3$</TEX> was prepared and effects of <TEX>$Sb_2$</TEX>O<TEX>$_3$</TEX> additives on its PTCR properties were investigated. <TEX>$The (Ba,Sr)TiO_3$</TEX> with 0.05～0.25 mol% <TEX>$Sb_2$</TEX><TEX>$O_3$</TEX> showed semiconducting PTCR behavior and anomalous grain growth was also observed when it was sintered above <TEX>$1330^{\circ}C$</TEX>. It was considered that charge compensation by doping 8b203 as well as abnormal grain growth by sintering lead to resistivity reduction from insulating to semiconducting transition.
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