Abstract
The influence of the reoxidation time on electrical properties and the positive temperature coefficient of resistance (PTCR) effect in multilayer Y2O3-doped BaTiO3 (BTO) ceramics were investigated. The BTO ceramics were sintered at 1160 °C−1270 °C for 2 h in a reducing atmosphere and then reoxidized at 500 °C–900 °C for 0 h−4 h. Results indicated that the room-temperature resistance of BTO ceramics reoxidized at 750 °C for 2 h after sintering at 1160 °C−1270 °C for 2 h decreased with the increasing of the sintering temperature. As the reoxidation time increased, the room-temperature resistance of the BTO samples slightly increased. In addition, the effect of the reoxidation time on the PTCR effect of the ceramics was also studied. The BTO ceramics had a low room-temperature resistance of 0.3 Ω and a resistance jump greater than 3.0 orders of magnitude.
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