2Sato Y,Tanaka T,Oba F,et al.Non-linear current-voltage characteristics related to native defects in SrTiO3 and ZnO bicrystals[J].Sci Technol Adv Mater,2003,4(6):605-611.
3Zhou L Q,Jiang Z H,Zhang S R,et al.Preparation and properties of Sr0.7Ba0.3TiO3-based multilayer boundary-layer capacitors[J].J Mater Sci,1992,(11):1134-1136.