重庆邮电大学学报（自然科学版）2007，Vol.19Issue(6)：764-766,3.
NBT基陶瓷中相变致电子发射的研究
Study of phase transition induced electron emission from NBT based ceramics
摘要
Abstract
The emission current density up to 20 A/cm2 from bismuth sodium titanate is reported. During the period of excited field,three peaks of current are observed which is different to other ferroelectric cathodes. Phase transition induced electron emission is considered and the formula based on polarization switch induced electron emission is revised. This amendment can explain the above phenomenon observed from NBT based ceramics well and shows that electron emission can not only be produced by polarization switch but also by other kind of polarization change such as phase transition. The unchanging of dielectric and piezoelectric constants in NBT before and after emission but decrease of these two parameters in PZT are tested. Phase transition induced emission in NBT and polarization switch induced emission in PZT can be testified by the above comparisons.关键词
相变致电子发射/抗疲劳铁电阴极/快极化反转/电流发射密度Key words
phase transition induced electron emission/lead free cathode/fast polarization switch/emitted current densities分类
数理科学引用本文复制引用
蔡雪梅,吴贵能,王宝英,陈世杰,郭曙光,张树人..NBT基陶瓷中相变致电子发射的研究[J].重庆邮电大学学报（自然科学版）,2007,19(6):764-766,3.基金项目
This work is supported by National Natural Science Foundation(60471027) （60471027）
