| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive characteristic thermistor which has a positive temperature coefficient of resistance and is used as a heater or a switching element, and which is low in its resistive value and large in its breakdown voltage, in particular, at room temperature. SOLUTION: In a method for preparing a composition contains barium titanate or its solid solution as its main component and at least one of rate earth elements and Nb, Bi, Sb oxides and SiO2 , Al2 O3 , and MnTiO3 as its subcomponents; MnTiO3 is added and mixed after being calcined and controlled, so that an average particle diameter ratio between the calcined crushed powder and MnTiO3 is 0.5-1.0, thereby forming a positive characteristic thermistor. |
