【摘要】 在 Y 掺杂的钛酸锶铅中,分别添加过量 PbO、SiO₂、ZrO₂制备之半导体陶瓷样品,在居里点（约 120℃）以上具有强的 PTC 效应,升阻比接近 5 个数量级。其中,SiO₂或 ZrO₂增强了居里点以下的 NTC 效应,降阻比可达 1个数量级;而少量 PbO 则降低了陶瓷的室温电阻率和 NTC 效应。通过热处理可以使热敏特性由 PTC 型向 NTC-PTC复合型转变,表明 NTC 效应与铅含量变化密切相关,控制铅挥发能获得不同热敏特性的钛酸锶铅半导体陶瓷。更多还原

【Abstract】 Y-doped Sr_0.5Pb_0.5TiO₃ semiconductor ceramics were prepared by adding the excess PbO, SiO₂ and ZrO₂, respectively. The ceramics sintered exhibit the strong PTC effect and the jump range is of the order of five when temperature is >tC. SiO₂ or ZrO₂-added samples have obvious NTC-PTC composite effects. Small addition of PbO helps to decrease ρ25 and the NTC effect. Transformation from PTC to NTC-PTC effects was observed in 4 mol% PbO-doped sample after heating-treatment at 950℃. The results indicate that the NTC effect is related to the variation of Pb amount. Semiconductor ceramics of （Sr, Pb）TiO3 with different thermo-sensitive property were obtained by controlling PbO loss.更多还原