Fatigue‐Free Aurivillius Phase Ferroelectric Thin Films with Ultrahigh Energy Storage Performance

Abstract

Dielectric capacitors have become a key enabling technology for electronics and electrical systems. Although great strides have been made in the development of ferroelectric ceramic and thin films for capacitors, much less attention has been given to preventing polarization fatigue, while improving the energy density, of ferroelectrics. Here superior capacitive properties and outstanding stability are reported over 107 charge/discharge cycles and a wide temperature range of −60 to 200 °C of ferroelectric Aurivillius phase Bi3.25La0.75Ti3O12‐BiFeO3 (BLT‐BFO), which represents one of the best capacitive performances recorded for the ferroelectric materials. The modification of BLT thin films with BFO overcomes the constraints of ferroelectric Aurivillius compounds and presents an unprecedented combination of the ideal features including improved polarization, reduced ferroelectric hysteresis, and lowered leakage current for high‐energy‐density capacitors. Given the lead‐free and fatigue‐free nature of this Aurivillius phase ferroelectric, this work unveils a new approach towards high‐performance eco‐friendly ferroelectric materials for electrical energy storage applications.

Dielectric films for high performance capacitive energy storage: multiscale engineering

“…It was indicated that a tensile chemical stress is created by the substitution of larger Fe 2+ and Fe 3+ ions for smaller Ti 4+ in Bi 3.25 La 0.75 Ti 3 O 12 -BiFeO 3 films, which decreases the free energy of the potential well at biased fields, increases the polarization and enhances U e . 60 On the other hand, a compressive chemical pressure induced by Li + /La 3+ ion doping in antiferroelectric (AFE) PbZrO 3 films could stabilize the AFE phase Fig. 3 (a) RSM of BFO-BTO dielectric films around the (103) peaks.…”

Progress and perspectives in dielectric energy storage ceramics

“…Normal ferroelectric possesses high P max while its high P r leads to that most of energy is dissipated during the discharge process. By contrast, relaxor ferroelectric exhibits slim P-E loop with high P max and low P r (i.e., high P = P max -P r ) meaning that electric energy can be effectively released, and thus obtains better energy storage performances [60]. Note that strengthening the relaxor characteristics and enhancing E b have become important factors for enhancing W rec .…”

Charged Domain Wall and Polar Vortex Topologiesin a Room Temperature Magnetoelectric Multiferroic Thin Film

“…[4][5] Aurivillius phases are established ferroelectric materials with strong in-plane polarisations, 6 high Curie temperatures (600°C) and fatigue-free energy storage performance. [7][8][9] The rare possibility of room temperature ferromagnetism within a ferroelectric framework is achieved in Aurivillius phases with the introduction of magnetic ions within the scaffold. 10-14 15 Bi6TixFeyMnzO18 ( x = 2.80 to 3.04; Y = 1.32 to 1.52; Z = 0.54 to 0.64) 16 where m = 5, is an example of such an ionsubstituted multiferroic Aurivillius phase, displaying saturation magnetization (MS) values of 215 emu/cm 3 , with in-plane saturation polarization (Ps) values of 26 C/cm 2 and with experimentally proven magnetoelectric switching.…”