Perovskite multiferroic thin films Bi_1-xLa_xFeO₃ and BiFe_1-yCo_yO₃ with different La³⁺,Co²⁺ molar content of x/y=0.05,0.10,0.15,0.20 have been fabricated on Pt(111)/Ti/SiO₂/Si(100)substrates through Sol-Gel method and annealed at 550 ℃ for 20 minutes.XRD structural characterization and performance tests of ferroelectric P-U loop,leakage current etc.were carried out.The results showed that the doping of La³⁺ andCo²⁺did not change the crystal structure of BFO,but the doping significantly improved the ferroelectricity and leakage property of the films,especially when the  x and y values were 0.15 respectively,the films Bi_0.85La_0.15FeO₃and BiFe_0.85Co_0.15O₃ both reached the optimal performance.On this basis,Bi_0.85La_0.15Fe_0.85Co_0.15O₃ thin films were prepared.The results showed that the composite doping achieved more ideal results than the single doping,in which the residual polarization 2P_r increases from 0.071 8 C/m² to 0.707 0 mC/m²,and the leakage current density also decreases by an order of magnitude than that of single doping.

Preparation and Electrochemical Properties of NiCo/CNT Composites [J]. Journal of Shenyang University of Chemical Technology, 2022, 36(5): 412-419.