Abstract
The crystalline structure, microstructure, and electrical properties of porous graphite-containing BaTiO 3-based PTC thermistors were studied. The sintered ceramics showed a tetragonal perovskite structure, irrespective of the added graphite content. The added graphite formed the interstitial solid solutions with Ba 0.999Sb 0.001TiO 3 and was distributed homogeneously in the sintered ceramics. The grain size of the as-sintered graphite-containing BaTiO 3-based ceramics was much larger than that of the as-sintered graphite-free ones. This is mainly due to the exothermic reactions of the graphites and oxygen molecules in the ceramics. The porosity of the as-sintered ceramics increased with increasing graphite content due to an enhanced evolution of CO and CO 2 gases associated with the exothermic reactions. It was found that the newly prepared porous graphite-containing BaTiO 3-based PTC thermistors showed a large PTCR effect.
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