BARIUM TITANATE-BASED SEMICONDUCTOR CERAMIC COMPOSITION AND PTC THERMISTOR

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Provided is a barium titanate-based semiconductor ceramic composition which contains no Pb, which can have an increased Curie temperature, which exhibits slight deterioration with time, and which has high reliability. The barium titanate-based semiconductor ceramic composition is represented by the composition formula (Ba1-x-y-z Sry(A1Bi)xA2z)TiO3, where A1 is an alkali metal element, A2 is a rare-earth element, and x, y, and z satisfy the following inequalities 0.03 ≤ x ≤ 0, 20, 0.02 ≤ y ≤ 0.20, 0.0005 ≤ z ≤ 0.015, and x - 0.10 ≤ y ≤ (5 / 4)·x. In addition, 0.01 to 0.20 molar parts of Mn per 100 molar parts of Ti is preferably added thereto.