Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film

Peng, Biaolin; Zhang, Qi; Bai, Gang; Leighton, Glenn J. T.; Shaw, Christopher P.; Milne, Steven J.; Zou, B. S.; Sun, Wenhong; Huang, Haitao; Wang, Zhong Lin

doi:10.1039/c9ee00269c

Cited by 107 publications

(52 citation statements)

References 57 publications

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“…Due to the applied electric field, a uniform rhombohedral phase transition occurs along the out-of-plane direction ( Figure 27 a). We proved this speculation by building a phase change model [ 92 ] ( Figure 27 b).…”

Section: Electrocaloric ( Ec ) Refrigerationmentioning

confidence: 86%

“…Lead-free relaxor ferroelectric thin film 0.5(Ba 0.8 Ca 0.2 )TiO 3 -0.5Bi(Mg 0.5 Ti 0.5 )O 3 (BCT-BMT) was prepared on Pt(111)/TiO x /SiO 2 /Si substrate by sol-gel method [ 92 ]. The BCT-BMT films have large energy density of 51.7 J·cm −3 and a high power density of 1.15 × 10 10 W·kg −1 at room temperature ( Figure 21 ).…”

Section: Thin-film Energy Storage Performancementioning

confidence: 99%

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Energy Storage and Electrocaloric Cooling Performance of Advanced Dielectrics

et al. 2021

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Dielectric capacitors are widely used in pulse power systems, electric vehicles, aerospace, and defense technology as they are crucial for electronic components. Compact, lightweight, and diversified designs of electronic components are prerequisites for dielectric capacitors. Additionally, wide temperature stability and high energy storage density are equally important for dielectric materials. Ferroelectric materials, as special (spontaneously polarized) dielectric materials, show great potential in the field of pulse power capacitors having high dielectric breakdown strength, high polarization, low-temperature dependence and high energy storage density. The first part of this review briefly introduces dielectric materials and their energy storage performance. The second part elaborates performance characteristics of various ferroelectric materials in energy storage and refrigeration based on electrocaloric effect and briefly shed light on advantages and disadvantages of various common ferroelectric materials. Especially, we summarize the polarization effects of underlying substrates (such as GaN and Si) on the performance characteristics of ferroelectric materials. Finally, the review will be concluded with an outlook, discussing current challenges in the field of dielectric materials and prospective opportunities to assess their future progress.

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Section: Electrocaloric ( Ec ) Refrigerationmentioning

confidence: 86%

Section: Thin-film Energy Storage Performancementioning

confidence: 99%

Energy Storage and Electrocaloric Cooling Performance of Advanced Dielectrics

et al. 2021

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“…The characteristics of the material are slow change of dielectric constant and enhanced ECE peaks (up to 12 K) at the T c , which is in accord with α 0 = 0.5. Peng et al reported giant ECE in relaxor Pb 0.8 Ba 0.2 ZrO 3 thin films, large‐positive or ‐negative ECE in Ferroelectric/antiferroelectric thin/thick films . The giant ECE peak of 45.3 K in Pb 0.8 Ba 0.2 ZrO 3 thin films at 290 K away from its Curie temperature (408 K) can be attributed to the ferroelectric coupling effect, which has more significant influence than the two others showing small twin‐peak ECEs at about 408 K. The negative ECE in antiferroelectrics should be originated from antiferroelectric coupling between neighbor dipoles in opposite directions which is the unique difference between antiferroelectric and ferroelectric materials.…”

Section: Discussionmentioning

confidence: 99%

Influence of polarization, reorientation, and coupling of dipole on electrocaloric effect in ferroelectrics

Chen

et al. 2019

Int J Applied Ceramic Tech

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Electrocaloric effects due to entropy change and dipole coupling upon electric field in second-order phase transition (tetragonal-cubic) ferroelectrics are investigated by a three-dimensional Devonshire's theory and statistic method. In diabatic condition, increase in vibration entropy to heat the ferroelectric is due to decreases in polarization entropy and configuration entropy of dipole reorientation in the specific directions. Coupling effect originated from the reorientation of dipoles accompany with electric hysteresis loop happens in the nearest neighbor dipoles parallel to electric field direction. Numerical simulations exhibit that polarization effect causes electrocaloric peak at the Curie's temperature independent of electric field, reorientation effect of dipole causes a shift of electrocaloric peak to high temperature with electric field, and coupling effect between dipoles gives rise to increase in electrocaloric effect with decreasing temperature. A method to predetermine the excellent electrocaloric effect of ferroelectrics from dielectric and/or polarization experimental results is proposed. K E Y W O R D Scoupling, electrocaloric effect, entropy, ferroelectrics, polarization | 1383 CHEN Et al.

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“…As Liu and Ren proposed a critical triple point MPB composition, exploring the morphotropic phase boundary (MPB) system could be an effective method to seek high-performance BCZT materials with excellent dielectric properties to be utilized for energy storage purposes. We also upgraded BCT-BZT to BCT-BMT and achieved excellent dielectric and energy storage properties which appeal the scientific community to try such up gradations [133,134]. Furthermore, these ceramics are sintered at too high temperatures, meaning that their synthesis process is hardly reproducible and the composition homogeneity is rather uncontrollable.…”

Section: Bczt Thin Films For Enhancement Of Dielectric Propertiesmentioning

confidence: 99%

Dielectric and Energy Storage Properties of Ba(1−x)CaxZryTi(1−y)O3 (BCZT): A Review

et al. 2019

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The Ba(1−x)CaxZryTi(1−y)O3 (BCZT), a lead-free ceramic material, has attracted the scientific community since 2009 due to its large piezoelectric coefficient and resulting high dielectric permittivity. This perovskite material is a characteristic dielectric material for the pulsed power capacitors industry currently, which in turn leads to devices for effective storage and supply of electric energy. After this remarkable achievement in the area of lead-free piezoelectric ceramics, the researchers are exploring both the bulk as well as thin films of this perovskite material. It is observed that the thin film of this materials have outstandingly high power densities and high energy densities which is suitable for electrochemical supercapacitor applications. From a functional materials point of view this material has also gained attention in multiferroic composite material as the ferroelectric constituent of these composites and has provided extraordinary electric properties. This article presents a review on the relevant scientific advancements that have been made by using the BCZT materials for electric energy storage applications by optimizing its dielectric properties. The article starts with a BCZT introduction and discussion of the need of this material for high energy density capacitors, followed by different synthesis techniques and the effect on dielectric properties of doping different materials in BCZT. The advantages of thin film BCZT material over bulk counterparts are also discussed and its use as one of the constituents of mutiferroic composites is also presented. Finally, it summarizes the future prospects of this material followed by the conclusions.

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Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film

Abstract: Ferroelectric/antiferroelectric thin/thick films with large positive or negative electrocaloric (EC) effects could be very useful in designing commercial refrigeration devices.

Cited by 107 publications

References 57 publications

Energy Storage and Electrocaloric Cooling Performance of Advanced Dielectrics

Energy Storage and Electrocaloric Cooling Performance of Advanced Dielectrics

Influence of polarization, reorientation, and coupling of dipole on electrocaloric effect in ferroelectrics

Dielectric and Energy Storage Properties of Ba(1−x)CaxZryTi(1−y)O3 (BCZT): A Review

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