| 摘要 |
Disclosed is a semiconductor ceramic material having PTC characteristics, which contains no Pb while having a high Curie point and a low resistivity. Specifically disclosed is a semiconductor ceramic material having PTC characteristics, which is represented by the following general formula: ABO, wherein A contains Ba, Ca, an alkali metal element, Bi and a rare earth element, and B contains Ti. This semiconductor ceramic material contains 5-20 parts by mole, preferably 12.5-17.5 parts by mole of Ca per 100 parts by mole of Ti. The alkali metal content/(Bi content + rare earth element content) ratio is preferably within the range of 1.0-1.06. In addition, this semiconductor ceramic material preferably contains 0.01-0.2 part by mole of Mn per 100 parts by mole of Ti.
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