Abstract
Porous and fine-grained (Ba,Sr)TiO 3 ceramics were fabricated in vacuum by the addition of partially oxidized Ti powders. The positive temperature coefficient of resistivity (PTCR) characteristics in the (Ba,Sr)TiO 3 ceramics appeared after paste-baking treatment at 580°C in air due to the adsorption of oxygen at grain boundaries, in the same behavior as ordinary air-sintered BaTiO 3 ceramics. It was found that the phase transition temperature from the tetragonal to cubic structure of (Ba,Sr)TiO 3 ceramics depends on the oxygen content and grain size. The electrical properties of the (Ba,Sr)TiO 3 ceramics were discussed, based on the microstructure, resistivity of grain boundaries, donor concentration of grains, and the electrical potential barrier of grain boundaries. The (Ba,Sr)TiO 3 ceramics containing the 5 vol.% partially oxidized Ti powders sintered at 1450°C showed a large PTCR effect greater than six orders of magnitude.
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