BARIUM TITANATE SEMICONDUCTOR CERAMIC COMPOSITION

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PROBLEM TO BE SOLVED : To provide a barium titanate semiconductor ceramic composition suitably used for a PTC (positive temperature coefficient) thermistor having a low resistance and a high withstand voltage usable for a large load such as an overcurrent protection element for an OA (office automation) instrument and a motor. SOLUTION : The composition comprises barium titanate as a major component and calcium titanate of 0.05-0.20 mol, strontium titanate of 20-30 mol, manganese oxide of 0.05-0.15 mol, silicon oxide of 2.5-3.5 mol, and an oxide of rare-earth element as a semiconducting agent of 0.25-0.30 mol based on barium titanate of 100 mol.