Abstract
We investigate the effect of calcination temperature on the positive temperature coefficient of resistivity (PTCR) characteristics in (Bax-0.002Sm0.002)TiO3 ceramics that were fired at 1250 °C for 30 min in a reducing atmosphere and reoxidized at 800 °C for 1 h in air. The results indicate that the room-temperature resistivity first decreased and then increased as calcination temperature increased from 1000 °C to 1200 °C. Moreover, the critical calcination temperature of 1150 °C is experimentally determined. The samples have a low room-temperature resistivity of 38.4 Ω·cm and exhibit a significant PTCR effect with a resistance jump of 2.1 orders of magnitude. Furthermore, the room-temperature resistivity of the S7 samples doped with a small amount of Mn(NO3)2 is much higher than that of the S3 specimens not doped with Mn(NO3)2 in our work.
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