| 摘要 |
PURPOSE:To obtain the title material having a uniform compsn. and stable switching temp. characteristics and useful as the material of a thermistor having positive characteristics by adding Ta2O5 to a powdery PbO-TiO2 mixture, calcining them at a specified temp., mixing the resulting calcined powder with BaTiO3-based calcined powder and pulverizing the mixture. CONSTITUTION:Ta2O5 contg. Ta as a semiconductor forming element is added to a powdery PbO-TiO2 mixture by 0.1-0.4atomic% and they are mixed and calcined at 750-950 deg.C to obtain calcined powder. BaCO3 is mixed with TiO2 or further mixed with Ta2O5, MnO2 and SiO2 for improving various characteristics so as to provide a prescribed desired compsn. and the mixture is calcined at 1,000-1,200 deg.C to obtain BaTiO3-based calcined powder. This calcined powder is mixed with said calcined powder in a prescribed ratio and pulverized. |
