Y掺杂(Ba_(0.6)Sr_(0.4))TiO_3材料的缓变PTC特性及复阻抗分析

Electrical characteristics and complex impedance analysis of Y-doped (Ba_(0.6)Sr_(0.4))TiO_3 positive temperature coefficient of resistivity materials

采用氧化物固相合成法制备了Ｙ掺杂（Ｂａ０．６Ｓｒ０．４）ＴｉＯ３材料，对１３５０℃／２ｈ烧结，然后自然降温方式下成瓷的样品进行了Ｒ－Ｔ特性测试及复阻抗分析。结果表明样品电阻上升区域为０～１８５℃，最大升阻比为２．９８个数量级，在１８５℃测试温度下样品的ρｍａｘ达到最大。变温复阻抗分析表明，材料的ＰＴＣ效应完全是一种晶界效应，复阻抗谱测试结果与Ｒ－Ｔ特性测试结果相一致。

Yttrium doped (Ba0.6Sr0.4)TiO3 materials were prepared by conventional oxide mixing method, sintered at 1350℃ for 2h,and naturally cooled. The R-T characteristics and impedance analysis were made to the sintered samples. the results indicate that (Ba0.6Sr0.4)TiO3 ceramics had a wide temperature range during 0-T(ρmax=185℃),and the resistance jump(ρmax/ρmin) is 102.98.The impedance analysis result concurred with the R-T results, and convinced that the PTC effect derived from the grain boundary.