| 摘要 |
<p>In a barium titanate-based semiconductor ceramic composition, a barium titanate-based semiconductor ceramic composition and a PTC element that have a high Curie temperature and a low electrical resistivity at room temperature and that exhibit a desired rate of change in resistance are provided. The barium titanate-based semiconductor ceramic composition is a barium titanate-based semiconductor ceramic composition having a perovskite structure containing at least barium and titanium, wherein some of the barium is replaced with at least an alkali metal element, bismuth, and a rare earth element, and when the content of the titanium is assumed to be 100 parts by mole, a ratio (the content of the alkali metal element)/{(the content of the bismuth) + (the content of the rare earth element)} which is a relationship between the contents of the alkali metal element, the bismuth, and the rare earth element, the contents being represented by parts by mole, is 1.00 or more and 1.06 or less. A PTC thermistor (1) includes a ceramic body (20) composed of the barium titanate-based semiconductor ceramic composition having the above feature and electrodes (11, 12) disposed on both side faces of the ceramic body (20).</p> |
