Ferroelectric Materials for Small-Scale Energy Harvesting Devices and Green Energy Products

Lallart, Mickaël; Guyomar, Daniel

doi:10.5772/23826

Cited by 9 publications

(10 citation statements)

References 58 publications

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“…Ferroelectrics are an important class of materials and are widely used in memory applications (because of their polarization switching), capacitors (because of their high dielectric constant), sensors (because of their piezoelectricity), and applications based on their optical effects (such as electro-optic effect, nonlinear optic effect, and anomalous photovoltaic effect, and so on). 1,2 A ferroelectric usually undergoes a structural phase transition. Above the transition temperature T c , it is in the paraelectric state, that is, an applied electric field induces an electric polarization, which goes to zero when the field is removed.…”

Section: ■ Introductionmentioning

confidence: 99%

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄

et al. 2014

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Many order-disorder-type phase transitions in molecule-based ferroelectrics are related to changes of molecular dynamics. If the molecular motions do not involve reorientations of dipole moments, their ordering fails to contribute directly to spontaneous electric polarization. For understanding ferroelectric mechanisms in these systems, it is important to clarify how such molecular dynamics changes induce structurally symmetry-breaking phase transitions and thus the appearance of spontaneous electric polarization. Systematic characterization of an [18]crown-6 based host-guest inclusion compound, [(DIPA)([18]crown-6)]BF4 (DIPA = 2,6-diisopropylanilinium), shows it is an excellent ferroelectric with a large dielectric anomaly, significant pyroelectricity, and SHG response, and rectangular polarizaiton-electric field hysterisis loops. By the combination of variable-temperature single-crystal structural determination and solid-state NMR observation, it is found that the slowing down of the rotation of the [18]crown-6 molecule and the tumbling of the BF4 anion causes the symmetry breaking, while the spontaneous polarization is induced by the relative displacement between the cationic and anionic sublattices. This investigation will contribute to a deeper understanding of the structure-property relationship in the emerging molecular ferroelectrics.

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Section: ■ Introductionmentioning

confidence: 99%

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄

et al. 2014

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“…(1) donde = 0 ( − 0∞ ) depende a la vez de la temperatura T de la nanoesfera y de la temperatura de transición T0∞ del PT. Allí 0 , β y ζ son coeficientes cuyos valores pueden obtenerse desde experimentos, o pueden calcularse por métodos de primeros principios (Lallart, 2011).…”

Section: Densidad De Energía Libreunclassified

Comportamiento de las Paredes de Dominio Ferroeléctricas en una Nanoesfera de Titanato de Plomo

Andrade

Lascano-Lascano

2020

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El objetivo del presente trabajo fue estudiar el comportamiento de las paredes de dominio ferroeléctricas en una nanoesfera de titanato de plomo bajo diferentes condiciones térmicas, eléctricas y mecánicas. Para ello se ha hecho uso de la teoría fenomenológica de Ginzburg-Landau y para obtener el estado de equilibrio se utilizaron principios variacionales; las ecuaciones que aparecen en el desarrollo se resolvieron analíticamente. Los resultados obtenidos proveen un perfil de la polarización dentro de las paredes de dominio 180° de la nanoesfera de titanato de plomo, así como el espesor de dicha pared en función de la temperatura y para distintas condiciones de la nanoesfera. Se observa que, con el aumento de la temperatura, el perfil de la polarización se reduce y el espesor de la pared crece al acercarse a cierta temperatura; todo lo cual permitiría sintonizar la temperatura de transición ferroeléctrica mediante el control del tamaño de la nanoestructura, de la presencia de cargas libres y de la aplicación de esfuerzos mecánicos.

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“…Crystalline compounds with spontaneous electrical polarization are widely used in various applications, such as capacitors, optical devices, memory cells, radars and sensors (Lallart, 2011). Many of the currently used ferroelectrics are based on lead and are environmentally unfriendly or rather expensive to produce.…”

Section: Introductionmentioning

confidence: 99%

Phase transition in an organic ferroelectric: glycinium phosphite, with and without X-ray radiation damage

Bogdanov

Zakharov

Chernyshov

et al. 2021

Acta Crystallogr Sect B

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Thermal evolution of an organic ferroelectric, namely, glycinium phosphite, was probed by multi-temperature single-crystal diffraction using synchrotron radiation and also by a similar experiment with a laboratory X-ray diffractometer. Both series of measurements showed a transition from the paraelectric to the ferroelectric state at nearly the same temperature, T c = 225 K. Temperature evolution of the unit-cell parameters and volume are drastically different for the synchrotron and laboratory data. The latter case corresponds to previous reports and shows an expected contraction of the cell on cooling. The data collected with the synchrotron beam show an abnormal nonlinear increase in volume on cooling. Structure analysis shows that this volume increase is accompanied by a suppression of scattering at high angles and an apparent increase of the anisotropic displacement parameters for all atoms; we therefore link these effects to radiation damage accumulated during consecutive data collections. The effects of radiation on the formation of the polar structure of ferroelectric glycinium phosphite is discussed together with the advantages and drawbacks of synchrotron experimentation with fine temperature sampling.

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Ferroelectric Materials for Small-Scale Energy Harvesting Devices and Green Energy Products

Cited by 9 publications

References 58 publications

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄

Comportamiento de las Paredes de Dominio Ferroeléctricas en una Nanoesfera de Titanato de Plomo

Phase transition in an organic ferroelectric: glycinium phosphite, with and without X-ray radiation damage

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Ferroelectric Materials for Small-Scale Energy Harvesting Devices and Green Energy Products

Cited by 9 publications

References 58 publications

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF4

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF4

Comportamiento de las Paredes de Dominio Ferroeléctricas en una Nanoesfera de Titanato de Plomo

Phase transition in an organic ferroelectric: glycinium phosphite, with and without X-ray radiation damage

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Product

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Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄

Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF₄