Abstract
The positive temperature coefficient of resistance (PTCR) properties of BaPbO3/polyethylene composites have been investigated as a function of the volume ratio of BaPbO3 to polyethylene. The PTCR effect increased up to nine orders of magnitude greater than that of semiconducting BaTiO3 ceramics. However, the PTCR effect decreased with increasing BaPbO3 content. The PTCR effect was dependent on the tunnelling current in the BaPbO3 intergrain gap. When the PTCR effect was measured repeatedly, the resistivity at room temperature increased, the PTCR effect decreased, and the transition temperature shifted to a lower value. These results could be explained by the thermal properties of polyethylene and the large structural change of composites in the repeated measurements.
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