Preparation and Energy Storage Properties of CaBi4Ti4O15-Bi(Fe0.93Mn0.05Ti0.02)O3 Ferroelectric Solid Solution Thin Films.

(1 - x) CaBi₄Ti₄O₁₅-xBi(Fe_0.93Mn_0.05Ti_0.02)O₃ (CBT-xBFMT, x = 0, 0.05, 0.10, 0.15) solid solution films were successfully prepared on Pt (111)/TiO₂/SiO₂/Si substrates using metal organic decomposition combined with spin coating technology. And the energy storage properties of CBT thin films were systematically studied by X-ray diffractometer, field emission scanning electron microscope, ferroelectric analyzer and impedance analyzer. The results show that the prepared films all exhibit a polycrystalline bismuth layered structure without other phase formation. The addition of BFMT into thin film obviously enhances the maximum polarization strength P_m and breakdown field strength E_b, reduces the leakage current density. With the increase of BFMT solid solution, the breakdown field strength E_b of CBT-xBFMT film increases first and then decreases, and reaches the maximum value at x = 0.10. The maximum polarization strength P_m gradually increases, and the largest polarization strength difference is obtained at x = 0.10. The largest polarization intensity difference and breakdown field strength make CBT-0.10BFMT film has the best energy storage properties. The recoverable energy storage density W_rec and energy storage efficiency η of CBT-0.10BFMT film are up to 82.8 J/cm³ and 78.3%, respectively. And its energy storage characteristic has good temperature stability in the temperature range of 25 ~ 150 °C. Therefore, CBT-0.10BFMT ferroelectric film is expected to be used in environmentally friendly micro energy storage devices. [ABSTRACT FROM AUTHOR]