Abstract
Changes in PTC behavior of several kinds of semiconductive BaTiO3 ceramics by heat-treatments in 10-5 Torr and in air at temperatures up to 500°C were measured. When an AC field and/or heat-treatments were applied in vacuum to a PTC material, the PTC jump was markedly decreased by 2 to 4 orders of magnitude. When reduced samples with a small PTC jump were heat-treated in O2 atmosphere at temperatures of 1100 to 1300°C, the PTC jump was gradually increased with increasing heat-treating temperature, approaching to the original characteristics of normally sintered materials. The experimental results were explained by the diffusion of oxygen ions through grain boundaries.
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