“…In recent years, people are trying to improve electrical properties for NBT thin film by a variety of methods, such as cation substitution [5], formation of multilayered structure [6], control of orientation [7], and forming solid solutions with other components [8][9][10][11][12]. Among them, site engineering is supposed to be an available way, not only for reducing the leakage current but also for improving the ferroelectric property of NBT film [13].…”