Preparation and properties of CaCu_3Ti_4O_(12) thin film grown on LaNiO_3-coated silicon by sol-gel process

摘要

CaCu_3Ti_4O_(12) (CCTO) thin film was prepared on LaNiO_3 (LNO)-coated silicon substrate by a sol-gel process. The CCTO sample is perovskite structure without any detectable impurities. Compared with the films grown on platinum (Pt), the CCTO thin film on LNO exhibits the (400) preferential orientation. It may be due to the LNO acts as seed layer during the growth of the CCTO film. It is indicated that the dielectric loss of CCTO thin film on LNO is lower than that of the films on Pt. The dielectric response of CCTO thin film on LNO can be described with the Debye relaxation model subjoining the contribution of conductance and diffusion effect.