Abstract
Nanoporous (Ba,Sr)(Ti,Sb)O 3 ceramics were fabricated by the addition of partially oxidized Ti powder of 4 wt.%, corn- and potato-starch of 20 wt.% into the (Ba,Sr)(Ti,Sb)O 3 powder, respectively. The effect of measuring atmosphere on the electrical properties of the porous (Ba,Sr)(Ti,Sb)O 3 ceramics and the role of oxygen on the grain boundaries in the PTCR characteristics of the (Ba,Sr)(Ti,Sb)O 3 ceramics were investigated. The electrical resistivity of the porous (Ba,Sr)(Ti,Sb)O 3 ceramics was measured in the air, O 2, N 2 and H 2 atmospheres during heating and cooling cycles. It was found that the PTCR characteristics and room-temperature resistivity of the porous (Ba,Sr)(Ti,Sb)O 3 ceramics decreased in reducing atmosphere mainly because of the decrease in potential barrier height, whereas it increased in oxidizing atmosphere mainly because of the increase in potential barrier height.
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