1999 Volume 107 Issue 1241 Pages 15-20
BaTiO3 semiconducting ceramics were fired according to a reduction-reoxidation method, and a fraction of the Ba ions were complexly substituted with both Ca and (Sr0.5Pb0.5). The effects of the complex substitution on the microstructure and electrical properties were experimentally investigated. The optimum fraction of the complex substitution was fixed from the viewpoints of small grain size, small resistivity at room temperature and large magnitude of resistivity jump above the Curie point. Using the optimum composition, a prototype multilayer sample with iridium foils as the internal electrodes was fabricated by reduction-reoxidation firing, and evaluated focusing on the formation of the internal electrodes and the electrical properties.
