| 摘要 |
A semiconductor ceramic and a positive-coefficient characteristic thermistor are provided which have a stable PTC characteristic, a high double point, and a wide operating temperature range. The semiconductor ceramic according to the present invention contains, as a main component, a Ba m TiO 3 -based composition having a perovskite structure expressed by a general formula A m BO 3 . Out of 100 mol% of Ti, Ti in a range of 0.05 mol% or more to 0.3 mol% or less is replaced with W as a semiconductor forming agent, a ratio m of A sites mainly occupied by Ba to B sites mainly occupied by Ti is 0.99 ‰¤ m ‰¤ 1.002, and an actually-measured sintered density is 70% or more and 90% or less of a theoretical sintered density. In the positive-coefficient characteristic thermistor, a component body is formed of the semiconductor ceramic.
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