采用溶胶-凝胶方法在FTO/glass底电极上制备了BiFeO_3/Bi_4Ti_3O_(12)和Bi_4Ti_3O_(12)/BiFeO_3多层薄膜.研究了室温下薄膜的结构,铁电性质和介电性质,并将其与纯的BiFeO_3薄膜的性质进行了比较.从薄膜的XRD模式中可以观察到共存的BiFeO_3相和Bi_4Ti_3O_(12)相.通过电滞回线测量可以看出,相对于纯的BiFeO_3薄膜,BiFeO_3/Bi_4Ti_3O_(12)和Bi_4T_(13)O_(12)/BiFeO_3多层薄膜能够承受更高的测试电场而获得充分极化,从而表现出较强的铁电性,在450 kV/cm测试电场下,薄膜的剩余极化强度分别为37 μLC/cm~2和23 μC/cm~2.
BiFeO_3/Bi_4Ti_3O_(12) multilayer film was prepared on FTO/glass bottom electrodes by sol-gel process. Structure, ferroelectric and Dielectric properties at room temperature were studied by comparing with pure BiFeO_3 film. BiFeO_3 and Bi_4Ti_3O_(12) phase can be identified from the XRD pattern. Comparing with pure BiFeO_3 film, the BiFeO_3/Bi_4Ti_3O_(12) and Bi_4Ti_3O_(12)/BiFeO_3 multilayer film can endure higher applied field and thus getting fully polarization and show more intense ferroelectricity, Under an applied field of 450 kV/cm , the remnant polarizations are 37 μC/cm~2 and 23 μC/cm~2, respectively.
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