Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Abstract

Thin films of cubic pyrochlore bismuth zinc niobate, a lead-free dielectric, were fabricated using a solution chemistry based upon the Pechini method. Scanning electron microscopy confirmed that the films are smooth and mostly dense. The films exhibit a dielectric constant of 145 AE 5, a low dielectric loss of 0.00065 AE 0.0001, and a room temperature, 1 kHz maximum field of approximately 4.7 MV/cm. At frequencies of 100 Hz and 10 kHz, the maximum field sustained by the material increased to 5.0 MV/cm and 5.1 MV/cm, although the dielectric loss increased to 0.0065 AE 0.001. At a measurement frequency of 10 kHz, the maximum energy storage density was 60.8 AE 2.0 J/cm 3 , while at a measurement frequency of 100 Hz, the maximum energy storage was~46.7 AE 1.7 J/cm 3 . As the temperature was increased to 200°C, the breakdown strength of the films decreased, while the loss tangent remained modest. At 200°C and a measurement frequency of 100 Hz, the maximum energy storage density was~23.1 AE 0.8 J/cm 3 , and at 10 kHz, the maximum energy storage density was 27.3 AE 1.0 J/cm 3 .

A novel lead‐free bismuth magnesium titanate thin films for energy storage applications

“…As reported, not only dielectric breakdown but also dielectric polarization is dominant to energy storage performances in dielectrics . Until now, some Bi‐based materials suitable for energy storage were reported by researchers, such as sodium bismuth titanate, bismuth zinc niobate (cubic pyrochlore structure) and BiFeO 3 . Li et al reported recoverable energy storage density of 13.02 ± 0.39 J/cm 3 in 0.9 (Bi 0.5 Na 0.5 )TiO 3 ‐0.1 PbTiO 3 thin film.…”

“…Li et al reported recoverable energy storage density of 13.02 ± 0.39 J/cm 3 in 0.9 (Bi 0.5 Na 0.5 )TiO 3 ‐0.1 PbTiO 3 thin film. Michael et al achieved large energy storage performances with a maximum energy storage of ~46.7 ± 1.7 J/cm 3 at 100 Hz in Bi 1.5 Zn 0.9 Nb 1.5 O 6.9 thin film and 66.9 ± 2.4 J/cm 3 in Bi 1.5 Zn 0.9 Nb 1.4 Ta 0.1 O 6.9 thin film, respectively. Although the energy storage performance of this system is comparable to that of lead‐containing materials, the cost of the expensive raw materials niobium ethoxide will limit its mass production.…”

Enhanced Energy Density in Core–Shell Ferroelectric Ceramics: Modeling and Practical Conclusions

“…Dielectric capacitors with the physical nature of ultrafast charge/discharge kinetics are promising candidates for energy storage devices . Moreover, due to the capability of delivering charges in an extremely short time, they are also widely used in today's advanced high‐power electric and electronic systems, from smart grids and switch power in consumer use to electric guns and direct energy weapons in military service, from oil drilling devices and spacecraft in harsh environment to magnetic resonance imaging and implantable defibrillators in medical system . In recent years, toward the demand of miniaturization, lightweight, and integration of electric and electronic devices, high‐energy density dielectric capacitors of reduced size are thus strongly desirable …”

“…[8][9][10] Moreover, due to the capability of delivering charges in an extremely short time, they are also widely used in today's advanced high-power electric and electronic systems, from smart grids and switch power in consumer use to electric guns and direct energy weapons in military service, from oil drilling devices and spacecraft in harsh environment to magnetic resonance imaging and implantable defibrillators in medical system. [11][12][13][14][15] In recent years, toward the demand of miniaturization, lightweight, and integration of electric and electronic devices, high-energy density dielectric capacitors of reduced size are thus strongly desirable. 13,16 In principle, the energy storage density (W) of dielectrics is determined by the integral of the applied electric field (E) with respect to the electric displacement (D) as W ¼ R EdD.…”

Crystal structure, dielectric, ferroelectric and energy storage properties of La-doped BaTiO3 semiconducting ceramics

“…Electrical energy storage capacitors for pulsed power applications need to accumulate a large amount of energy with fast discharge capability and high frequencies on the order of several kilohertz. 17 Low high-electric field loss pulsed power capacitors find uses in a wide variety of applications from industrial lasers used for cutting and welding, to critical biomedical devices, such as heart defibrillators and X-ray equipment. 18,19 Pocket sized pulsed power capacitors are utilized in the development of implantable defibrillators.…”