Ferroelectric, Piezoelectric Mechanism and Applications

Singh, Arun; Monga, Shagun; Neeraj, S.; Sreenivas, K.; Katiyar, Ram S.

doi:10.1080/21870764.2022.2075618

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…These values are much smaller than those of classical inorganic ceramic ferroelectrics and organic polymers, such as BaTiO 3 ( E c ≈ 30 kV/cm), PbTiO 3 ( E c ≈ 21 kV/cm), BiFeO 3 ( E c ≈ 200 kV/cm), LiNbO 3 ( E c ≈ 230 kV/cm), P(VDF-TrFE) ( E c ≈ 500 kV/cm) and Nylon-11 ( E c ≈ 600 kV/cm) . In general, the displacement of atoms in oxide materials plays a major role in their phase transition, while the order–disordering of organic cations in organometallic hybrid perovskites dominates their structural transformation . Deep analysis shows that the rotation of organic primitives in organometallic hybrid perovskites may require a smaller driving force for polarization inversion than the atomic-shift type in oxide materials.…”

Section: Results and Discussionmentioning

confidence: 91%

“…49 In general, the displacement of atoms in oxide materials plays a major role in their phase transition, while the order−disordering of organic cations in organometallic hybrid perovskites dominates their structural transformation. 50 Deep analysis shows that the rotation of organic primitives in organometallic hybrid perovskites may require a smaller driving force for polarization inversion than the atomicshift type in oxide materials. Such relatively low E c of 1 suggests that its P s inversion can be achieved under low electric fields, which will undoubtedly bring advantages to the integration of micro devices.…”

Section: Ferroelectric and Antiferroelectric Propertiesmentioning

confidence: 99%

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Field-Induced Antiferroelectric–Ferroelectric Transformation in Organometallic Perovskite Displaying Giant Negative Electrocaloric Effect

Han,

Bie,

et al. 2024

J. Am. Chem. Soc.

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Antiferroelectric materials with an electrocaloric effect (ECE) have been developed as promising candidates for solid-state refrigeration. Despite the great advances in positive ECE, reports on negative ECE remain quite scarce because of its elusive physical mechanism. Here, a giant negative ECE (maximum ΔS ∼ −33.3 J kg −1 K −1 with ΔT ∼ −11.7 K) is demonstrated near room temperature in organometallic perovskite, iBA 2 EA 2 Pb 3 I 10 (1, where iBA = isobutylammonium and EA = ethylammonium), which is comparable to the greatest ECE effects reported so far. Moreover, the ECE efficiency ΔS/ΔE (∼1.85 J cm kg −1 K −1 kV −1 ) and ΔT/ΔE (∼0.65 K cm kV −1 ) are almost 2 orders of magnitude higher than those of classical inorganic ceramic ferroelectrics and organic polymers, such as BaTiO 3 , SrBi 2 Ta 2 O 9 , Hf 1/2 Zr 1/2 O 2 , and P(VDF-TrFE). As far as we know, this is the first report on negative ECE in organometallic hybrid perovskite ferroelectric. Our experimental measurement combined with the first-principles calculations reveals that electric field-induced antipolar to polar structural transformation results in a large change in dipolar ordering (from 6.5 to 45 μC/cm 2 under the ΔE of 18 kV/cm) that is closely related to the entropy change, which plays a key role in generating such giant negative ECE. This discovery of field-induced negative ECE is unprecedented in organometallic perovskite, which sheds light on the exploration of next-generation refrigeration devices with high cooling efficiency.

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Section: Results and Discussionmentioning

confidence: 91%

Section: Ferroelectric and Antiferroelectric Propertiesmentioning

confidence: 99%

Field-Induced Antiferroelectric–Ferroelectric Transformation in Organometallic Perovskite Displaying Giant Negative Electrocaloric Effect

Han,

Bie,

et al. 2024

J. Am. Chem. Soc.

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“…The ferroelectric properties of ferroelectrics could be manifested by the polarization-electric field hysteresis loops ( P – E loops). , Figure displays the P – E loops of NBST ceramics doped with different concentrations of Sm 3+ at a frequency of 10 Hz. Sm 3+ doping led to significant changes in the E b of the NBST ceramic system.…”

Section: Resultsmentioning

confidence: 99%

Energy Storage and Charge/Discharge Performance of Sm-Doped NBT-Based Lead-Free Ceramics

Zhao,

Zhang,

et al. 2023

ACS Appl. Electron. Mater.

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(Na0.5Bi0.5)0.75Sr0.25TiO3–x Sm2O3 ceramics (denoted as NBSTS x ) were obtained by the solid-state reaction method, and their crystal structure and morphological characteristics were characterized by X-ray diffractometer mapping (XRD) and scanning electron microscopy (SEM). The NBSTS x ceramics, when doped with a concentration of x = 0.03, demonstrated outstanding performance in terms of maximum recoverable energy storage density (W rec ∼ 3.35 J/cm3) and energy storage efficiency (η ∼ 84.8%). This ceramic exhibited the highest potential at an electric field strength of 210 kV/cm. Additionally, the thermal stability of NBSTS0.03 ceramic remained constant within the temperature range of 30–90 °C, while their frequency stability covered the range of 10–1000 Hz. By analyzing the dielectric spectra of the material, we investigated the variation of the relative permittivity (εr ) and the dielectric loss angle tangent (tan δ), and we probed the relaxation behavior by means of a modified Curie–Weiss law. The NBSTS x ceramic with a density of x = 0.03 exhibited a fast charge/discharge rate of 128 ns and a discharge energy density of 1.06 J/cm3. From the impedance spectra, the relaxation phenomena observed in the system could potentially be attributed to the migration of oxygen vacancies.

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“…9 In addition to ferroelectricity, ferroelectric materials possess other unique features, for example, switchable second harmonic generation, 14 electro-optic modulation, 18 energy storage capacitors, 19 and acousto-optics. 20,21 To make these applications possible, it is crucial to fully understand the electrooptical properties of these materials and to accurately control the alignment of the LC director. For a device with a particular alignment direction, often twisted domains are formed, [9][10][11] or two domains are observed in which the polarization is pointing in opposite directions.…”

Section: Introductionmentioning

confidence: 99%

Lateral electric field switching in thin ferroelectric nematic liquid crystal cells

Hsiao,

Nys,

Neyts

2023

Soft Matter

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Ferroelectric, Piezoelectric Mechanism and Applications

Cited by 8 publications

References 46 publications

Field-Induced Antiferroelectric–Ferroelectric Transformation in Organometallic Perovskite Displaying Giant Negative Electrocaloric Effect

Field-Induced Antiferroelectric–Ferroelectric Transformation in Organometallic Perovskite Displaying Giant Negative Electrocaloric Effect

Energy Storage and Charge/Discharge Performance of Sm-Doped NBT-Based Lead-Free Ceramics

Lateral electric field switching in thin ferroelectric nematic liquid crystal cells

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