Ca^(2+)掺杂对PTCR元件电性能的影响

EFFECT OF Ca 2+ DOPED ON ELECTRONIC PROPERTY OF PTCR THERMORESISTORS

研究了Ｃａ２＋取代Ｂａ２＋后对ＰＴＣＲ材料电性能的影响，发现随着Ｃａ２＋含量的增加，ＢａＴｉＯ３系ＰＴＣＲ样品的平均晶粒直径单调下降，耐电压性能单调上升．Ｃａ２＋取代量在一定范围内，常温电阻率变化不大，但超过一定值后，常温电阻率急剧上升．这种现象与晶界缓冲效应有关．

It is studied that the effect of Ca 2+ substitute for Ba 2+ on electronic property of PTCR thermoresistors. It is found that the average diameter of BaTiO 3 series PTCR component decrease and breakdown voltage increase with Ca 2+ content increasing. When the replacement content is less than 8 % (mol/mol), the specific resistance at room temperature varies little, but if the content is more than 12 % (mol/mol), the specific resistance increases rapidly. This phenomenon is related to the effect of grainbroundary buffer.