Abstract:A novel lead-free relaxor ferroelectric ceramic of (0.67 -x)BiFeO 3 -0.33BaTiO 3 -xBa(Mg 1/3 Nb 2/3 )O 3 [(0.67 -x)BF-0.33BT-xBMN, x = 0-0.1] was prepared by a solid-state reaction method. A relatively high maximum polarization P max of 38 lC/cm 2 and a low remanent polarization P r of 5.7 lC/cm 2 were attained under 12.5 kV/mm in the x = 0.06 sample, leading to an excellent energy-storage density of W~1.56 J/cm 3 and a moderate energy-storage efficiency of g~75%. Moreover, a good temperature stability of the … Show more
“…6). This should be pinned on the increase of electrical conduction loss and similar phenomena have been reported in polymer and ceramic dielectrics 6,35 . The conduction loss and FE loss of the BFSTO films at various temperatures are decoupled based on the method by Khanchaitit et al 36 , as shown in Supplementary Fig.…”
Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm−3, together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering. It is revealed that the incorporation of strontium titanate transforms the ferroelectric micro-domains of bismuth ferrite into highly-dynamic polar nano-regions, resulting in a ferroelectric to relaxor-ferroelectric transition with concurrently improved energy density and efficiency. Additionally, the introduction of strontium titanate greatly improves the electrical insulation and breakdown strength of the films by suppressing the formation of oxygen vacancies. This work opens up a feasible and propagable route, i.e., domain engineering, to systematically develop new lead-free dielectrics for energy storage.
“…6). This should be pinned on the increase of electrical conduction loss and similar phenomena have been reported in polymer and ceramic dielectrics 6,35 . The conduction loss and FE loss of the BFSTO films at various temperatures are decoupled based on the method by Khanchaitit et al 36 , as shown in Supplementary Fig.…”
Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm−3, together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering. It is revealed that the incorporation of strontium titanate transforms the ferroelectric micro-domains of bismuth ferrite into highly-dynamic polar nano-regions, resulting in a ferroelectric to relaxor-ferroelectric transition with concurrently improved energy density and efficiency. Additionally, the introduction of strontium titanate greatly improves the electrical insulation and breakdown strength of the films by suppressing the formation of oxygen vacancies. This work opens up a feasible and propagable route, i.e., domain engineering, to systematically develop new lead-free dielectrics for energy storage.
“…To meet the demands for electrical energy‐storage capacitors in the field of pulsed power applications and the increasing demands of society, dielectric capacitors for high energy‐storage density devices have been widely investigated and have played a vital role, especially in ceramic capacitors . In comparison to batteries and other energy‐storage devices, ceramic capacitors possess a faster charge–discharge rate and superior mechanical and thermal properties .…”
A series of Bi(0.5−x)Lax(Na0.82K0.18)0.5Ti0.96Zr0.02Sn0.02O3 (BNKTZS‐xL) (x=0–0.18) lead‐free ceramics were designed and fabricated by using a conventional solid‐state sintering method. The effects of the La3+ content on the properties of the BNKTZS‐xL ceramics were systematically investigated. Temperature‐dependent dielectric constant curves displayed two depressed anomalies, which resulted in significantly improved dielectric temperature stability. The polarization–electric field hysteresis loops illustrated that the addition of La3+ markedly enhanced the breakdown strength, energy‐storage density, and energy‐storage efficiency. A maximum energy‐storage density of 1.95 J cm−3 was obtained for the material with x=0.10, and the energy‐storage efficiency significantly improved from 28 to 85 % upon increasing the value of x from 0 to 0.18. These properties indicate that the BNKTZS‐xL ceramics may be promising lead‐free materials for high energy‐storage capacitor applications.
“…A slow and slight increase in the P
max value can be seen with increasing the temperature, indicating that ergodic and/or nonergodic relaxor states could be transformed into a long-range ferroelectric order 4 . A gradual decrease in P
r and the P-E loops become slimmer and slimmer with increasing the temperature, which is attributed to the decrease of content of nonergodic phase 4 . Therefore, the gradual decrease in P
r and increase in P
max are beneficial to improve energy storage properties over a broad temperature range.…”
Section: Resultsmentioning
confidence: 99%
“…For further evaluating energy storage performance of the (1-x)LLBNTZ-xNBN ceramics, the comparison of W
1 and BDS between (1-x)BBNT-xNBN ceramics and other lead-free ceramics in recently reported results are shown in Fig. 9
1, 4, 10, 14, 16, 22, 23, 37, 40, 69–75 . It can be seen that the values of W
1 and BDS for (1-x)LLBNTZ-xNBN ceramics are higher than those of other lead-free ceramics.Figure 8Calculated energy storage density, energy loss density and energy storage efficiency as a function of electric field for the (1-x)LLBNTZ-xNBN ceramics at room temperature.Figure 9Comparison of W
1 and BDS between (1-x)LLBNTZ-xNBN ceramics and other lead-free ceramics.…”
Section: Resultsmentioning
confidence: 99%
“…In order to meet the increasing demand for electrical energy storage capacitors in the field of pulse power applications, especially dielectric ceramic capacitors for high energy storage density devices, have been widely investigated and played more and more important roles 1–4 . Compared with batteries and other energy storage devices, ceramic capacitors possess faster charge-discharge rate, superior mechanical and thermal properties 5–7 .…”
A series of (1-x)Bi0.48La0.02Na0.48Li0.02Ti0.98Zr0.02O3-xNa0.73Bi0.09NbO3 ((1-x)LLBNTZ-xNBN) (x = 0-0.14) ceramics were designed and fabricated using the conventional solid-state sintering method. The phase structure, microstructure, dielectric, ferroelectric and energy storage properties of the ceramics were systematically investigated. The results indicate that the addition of Na0.73Bi0.09NbO3 (NBN) could decrease the remnant polarization (P
r) and improve the temperature stability of dielectric constant obviously. The working temperature range satisfying TCC
150
°C ≤±15% of this work spans over 400 °C with the compositions of x ≥ 0.06. The maximum energy storage density can be obtained for the sample with x = 0.10 at room temperature, with an energy storage density of 2.04 J/cm3 at 178 kV/cm. In addition, the (1-x)LLBNTZ-xNBN ceramics exhibit excellent energy storage properties over a wide temperature range from room temperature to 90 °C. The values of energy storage density and energy storage efficiency is 0.91 J/cm3 and 79.51%, respectively, for the 0.90LLBNTZ-0.10NBN ceramic at the condition of 100 kV/cm and 90 °C. It can be concluded that the (1-x)LLBNTZ-xNBN ceramics are promising lead-free candidate materials for energy storage devices over a broad temperature range.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
