Abstract
Porous semiconducting (Ba, Sr)TiO3 ceramics were fabricated by the addition of potato-starch to the (Ba, Sr)TiO3 powders. The effects of potato-starch on the microstructure and PTCR characteristics of the porous (Ba, Sr)TiO3 ceramics have been investigated. The porosity largely increased and the grain size slightly decreased with increasing potato-starch content. The crystalline structure of (Ba, Sr)TiO3 ceramics was independent of the potato-starch content. The (Ba, Sr)TiO3 ceramics containing potato-starch showed higher PTCR (106) characteristics than that of the (Ba, Sr)TiO3 ceramics without potato-starch. It was found that the development of PTCR characteristic in the porous (Ba, Sr)TiO3 ceramics containing various amounts of potato-starch, in the same way as normal BaTiO3 ceramics without potato-starch, is associated with grain boundaries, from the impedance analysis.
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