Abstract
Semiconducting porous (Ba,Sr)TiO 3 ceramics were prepared by sintering at 1350 °C in vacuum followed by reoxidation at 400–800 °C in air. The effect of reoxidation on the PTCR characteristics of the porous (Ba,Sr)TiO 3 ceramics was investigated. It was found that the PTCR effect of the (Ba,Sr)TiO 3 ceramics was developed at high reoxidation temperatures (≥550 °C), and also the magnitude of the PTCR effect increased with increasing reoxidation temperature. The role of oxygen on the grain boundaries in the PTCR characteristics was also discussed.
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