BARIUM TITANATE SEMICONDUCTOR CERAMIC, BARIUM TITANATE SEMICONDUCTOR CERAMIC COMPOSITION, AND PTC THERMISTOR FOR TEMPERATURE DETECTION

摘要

Provided is a positive temperature coefficient thermistor for temperature detection, which has a low room-temperature resistance, a low detection temperature, and a high degree of detection accuracy. For a semiconductor ceramic 1, a barium titanate semiconductor ceramic is used which contains, as its main constituent, a perovskite-type compound containing Ba, Ca, Sr, and Ti, and further contains R (R represents at least one selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), Mn, and Si, where when the barium titanate semiconductor ceramic is dissolved, the Ca content x in parts by mol, the Sr content y in parts by mol, and the Mn content z in parts by mol in a case of Ti regarded as 100 parts by mol respectively meet 20 ‰¤ x ‰¤ 25, 19 ‰¤ y ‰¤ 25, and 0.01 ‰¤ z ‰¤ 0.03, and meet y ‰¥ -0.8x + 37 in a case of 0.01 ‰¤ z 0.019, and y ‰¤ -x+48 in a case of 0.021 z ‰¤ 0.03.