摘要
对(Ba1-xPbx)TiO3基PTCR热敏元件进行的热疲劳研究发现:元件的热疲劳特征与热循环温度以及材料的居里温度密切相关。当热循环温度低于材料的居里温度时,元件的室温电阻率随热循环次数的增加而增加;但当热循环温度高于材料的居里点时,元件的室温电阻率在初始热循环阶段出现负增长现象,然后才随循环次数的增加而增加。对不同温度下的热疲劳机理进行了探讨,并提出Bi是提高(Ba1-xPbx)TiO3系热敏元件性能稳定性较为理想的掺杂元素。
The study of thermal fatigue behavior of （Ba1-xPbx）TiO3 based PTCR thermistors reveals that the thermal fatigue behaviors are closely related to the applied temperature and the Curie temperature of the ferroelectrics. When the treatment temperatures are lower than related Curie points, the room-temperature resistivities increase monotonously with thermal cycles. However, when the treatment temperatures are higher than related Curie points, the room-temperature resistivities decrease at the initial thermal cycle stage, and then increase with further the thermal cycles. Thermal fatigue mechanisms of （Ba1-xPbx）TiO3 thermistors are supposed for various applied temperatures. And Bi2O3 is approved to be an effective candidate as a dopant for improving property stability of （Ba1-xPbx）TiO3 thermistors.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2007年第8期133-135,139,共4页
Materials Reports
基金
中南大学科学研究基金(76112019
76112020)
关键词
PTCR铁电陶瓷
热疲劳
电性能
PTCR ferroelectric ceramics, thermal fatigue, electrical property
