摘要
用溶胶-凝胶方法在LaNiO3底电极上制备了500℃退火的BiFeO3薄膜。研究了室温下薄膜的结构,介电与铁电性质和漏电流性质。XRD研究表明薄膜呈R3m结构,没有观察到不纯相。铁电性研究表明,薄膜具有大的剩余极化强度,在600 kV/cm的测试电场下,薄膜的剩余极化强度为20μC/cm2,矫顽场为440 kV/cm。介电性质研究表明,在整个测试频率范围内,薄膜具有小的介电损耗。而漏电流特性测试表明,通过工艺的改进,有效的限制了BiFeO3薄膜的漏电流。
BiFeO3 film was prepared on LaNiO3 bottom electrodes by sol - gel process annealed at 500℃. Structure, dielectric, ferroelectric and leakage conduction properties at room temperature were studied. XtlD study shows that the film adopts R3m structure and no impure phase was observed. The study of ferroeleetricity shows that the film has large remanent polarization （Pr）, the Pr is 20 μC/cm^2 under an applied field of 700 kV/crn. The coercive field is 440 kV/em. The study on dielectric property shows that film indicated small dielectric loss at the whole frequency range. While the study on leakage current char- acteristic indicates that the leakage current is reduced through the improvement of preparation tehchnology.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2008年第5期895-899,共5页
Journal of Functional Materials and Devices
基金
感谢湖北省教育厅项目资助(Q200722002)
黄石市科技局项目
湖北师范学院重点项目(2006A15)资助
关键词
BIFEO3薄膜
铁电性
介电性质
漏电流
BiFeO3 film
ferroelectricity
dielectric property
leakage current
