Готові списки джерел за темами / Ferro-electricity

Добірка наукової літератури з теми "Ferro-electricity"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Ferro-electricity"

1

Li, Zhong, Jian Wang, Xiao Wang, Qinghao Yang, and Zhicheng Zhang. "Ferro- and piezo-electric properties of a poly(vinyl fluoride) film with high ferro- to para-electric phase transition temperature." RSC Advances 5, no. 99 (2015): 80950–55. http://dx.doi.org/10.1039/c5ra15149j.

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Анотація:
Excellent ferro- and piezo-electricity is observed for the first time in poly(vinyl fluoride) with a ferro- to para-electric transition at 168 °C, a coercive electric field of 120 MV m−1 and a relatively large piezoelectric coefficient of −11 pC N−1.
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2

Kan, Erjun, Fang Wu, Kaiming Deng, and Weihua Tang. "High-temperature ferro-electricity in two-dimensional atomic crystal." Applied Physics Letters 103, no. 19 (November 4, 2013): 193103. http://dx.doi.org/10.1063/1.4829268.

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3

Zubtsov, V. I. "Technology to Increase Energy Density of Electric Car Batteries." International Journal of Electrical Engineering and Computer Science 4 (September 2, 2022): 40–44. http://dx.doi.org/10.37394/232027.2022.4.6.

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The article deals with a small-sized unit developed using ferro-piezoelectric ceramics for electric power generation. The use of an electrochemical generator in the unit makes it possible to increase the efficiency of electricity generation by controlling the polarization of ferro-piezoelectric ceramics. At the consumption of 1 joule of electricity, using mechanical energy, 3, 5...5 joules of output electrical energy are generated. The increase in the energy density of the batteries occurs in two stages: the first stage is to increase the degree of polarization of the segmentelectric, the second stage is to increase the electrical power to the load. The power plant efficiency is about 55...60 percent and depends on the ceramic modification and the electric circuit.
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4

Tsutsumi, Naoto, Shinya Yoda, and Wataru Sakai. "Infrared spectra and ferro-electricity of ultra-thin films of vinylidene fluoride and trifluoroethylene copolymer." Polymer International 56, no. 10 (2007): 1254–60. http://dx.doi.org/10.1002/pi.2268.

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5

Fukuda, Atsuo, Hiroyuki Hakoi, Miho Sato, and Mikhail A. Osipov. "Fluctuation Forces Stabilizing Two Kinds of Staircases in Chiral Tilted Fluid Smectics Frustrated between Ferro- and Antiferro-Electricity." Molecular Crystals and Liquid Crystals 398, no. 1 (January 2003): 169–87. http://dx.doi.org/10.1080/15421400390221628.

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6

Ma, Rongchao, Yixin Zhou, and Jing Liu. "Floating and flying ferrofluid bridges induced by external magnetic fields." Modern Physics Letters B 29, no. 09 (April 10, 2015): 1550029. http://dx.doi.org/10.1142/s0217984915500293.

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Анотація:
A ferrofluid is a mixture that exhibits both magnetism and fluidity. This merit enables the ferrofluid to be used in a wide variety of areas. Here we show that a floating ferrofluid bridge can be induced between two separated boards under a balanced external magnetic field generated by two magnets, while a flying ferrofluid bridge can be induced under an unbalanced external magnetic field generated by only one magnet. The mechanisms of the ferrofluid bridges were discussed and the corresponding mathematical equations were also established to describe the interacting magnetic force between the ferro particles inside the ferrofluid. This work answered a basic question that, except for the well-known floating water bridges that are related to electricity, one can also build up a liquid bridge that is related to magnetism.
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7

Wiscons, Ren A., and Adam J. Matzger. "Utilizing plane group symmetry to favor noncentrosymmetry in three-dimensional crystals." Canadian Journal of Chemistry 98, no. 7 (July 2020): 327–31. http://dx.doi.org/10.1139/cjc-2019-0402.

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Анотація:
Materials that lack inversion symmetry (noncentrosymmetric) demonstrate a diversity of desirable optical and electronic properties in bulk such as second harmonic generation, chiral emission, and piezo-, pyro-, and ferro-electricity. Unfortunately, it is challenging to reliably access noncentrosymmetric packing motifs because the closest packing of molecules is often achieved through inversion symmetry operators, leading to the relatively low occurrence of noncentrosymmetry in organic crystals. In this study, the occurrence of noncentrosymmetry in materials that adopt planar packing motifs is investigated because molecular species achieve closest packing in two dimensions through rotations and (or) glides, symmetry operators that do not individually lead to centrosymmetry. It is found that of the 18 crystal structures investigated here adopting planar packing motifs, 13 structures (72%) are noncentrosymmetric showing in-plane polarization. The 13 noncentrosymmetric crystal structures differ from the centrosymmetric structures by directional halogen bonding interactions or steric collisions that align the polarization directions of neighboring layers, leading to bulk structural polarity. The results from this investigation will be of use for designing noncentrosymmetric materials for application in optical and electronic devices.
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8

Goodby, John W. "Twisted and frustrated states of matter." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2142 (February 22, 2012): 1521–42. http://dx.doi.org/10.1098/rspa.2011.0685.

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Анотація:
The World, and much of Nature that we see within it, experiences an environment of reduced symmetries. For example, living organisms are dependent on asymmetric or dissymmetric structures for their life processes. In the solid state, a large number of space groups are chiral. Conversely, in liquids, the effects of reduced symmetries are smeared out owing to the dynamical fluctuations of the constituent molecules, atoms or ions. Thus, on progressing from the strongly ordered solid to the amorphous liquid state, the effects of reduced symmetries weaken as the molecular or atomic correlations and penetration lengths fall. Between these two states of matter, the fourth state of organized fluids can be markedly affected by chirality, and over substantial length scales, owing to both the fluidity and partial ordering of the molecules. In effect, complex fluids can amplify the effects of chirality at the molecular level. Broken symmetries in self-organizing systems can lead to the formation of novel phases of matter and to the creation of structured liquids, and to the generation of nonlinear properties such as heli-, ferro-, ferri- and antiferro-electricity, and electroclinism, which can be harnessed in a wide range of applications including thermal sensors, imaging devices and information displays, to name but a few.
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9

Carpenter, Chris. "Potential Revealed for Hydrogen Production From Offshore Wind in Uruguay." Journal of Petroleum Technology 75, no. 09 (September 1, 2023): 85–87. http://dx.doi.org/10.2118/0923-0085-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 31879, “Assessment of the Potential for Hydrogen Production From Bottom‑Fixed Offshore Wind in Uruguay,” by Juan Tomasini, SPE, Pablo Gristo, SPE, and Santiago Ferro, SPE, ANCAP, et al. The paper has not been peer reviewed. Copyright 2022 Offshore Technology Conference. Reproduced by permission. _ With almost the entire electricity matrix having been decarbonized, the next step in the Uruguayan energy transition includes the development of a hydrogen economy. In the complete paper, the authors present the results of the assessment of two regions suitable for bottom-fixed offshore wind energy (OWE) technologies. Results are encouraging and could lead to new possibilities in supporting the development of a hydrogen economy. Introduction For Uruguay, hydrogen is expected to play an important role in tackling the various challenges of the second phase of decarbonization; it holds the potential for use in the transport sector and in raw materials and chemical products. Having no oil production, Uruguay is a net oil importer; therefore, the extensive use of hydrogen in the domestic market may have a profound effect on the national economy and energy sovereignty. Preliminary findings show that Uruguay may have hydrogen production costs between $1.2 and $1.4/kg, placing the country among the world’s net exporters. Green Hydrogen Production From Offshore Renewable Energy Compared with onshore wind, OWE presents several advantages, including a greater capacity of each turbine (fewer turbines required for the same wind-farm capacity) and the availability of larger areas (allowing larger wind-farm capacity). Even if bottom-fixed is the predominant technology for OWE projects, floating technology is attracting increasing investment and public policy support because of its potential to access wind resources at water deeper than 40 m, where bottom-fixed may be less feasible technically, economically, or logistically. Green Hydrogen Production. Contrasting with blue or gray hydrogen (produced from fossil fuels with or without carbon capture and storage, respectively), green hydrogen provides the lowest near-zero-emissions option. Green hydrogen can be produced through the gasification of biomass or the electrolysis of water powered by renewable electricity. Alkaline electrolysis and proton-exchange-membrane (PEM) technologies are widely available commercially. Alkaline electrolysis is a fully mature technology that represents the lower-cost option, but its operational load limits are not as broad as those for PEM; therefore, its coupling with variable renewable sources should be carefully managed. On the other hand, PEM electrolysis is not yet a fully mature technology, with higher costs that are expected to be reduced in the coming years.
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10

Matsumoto, Takahiro, Atsuo Fukuda, Masahiro Johno, Yuki Motoyama, Tomoyuki Yui, San-Seong Seomun, and Mamoru Yamashita. "A novel property caused by frustration between ferroelectricity and antiferroelectricity and its application to liquid crystal displays-frustoelectricity and V-shaped switching." Journal of Materials Chemistry 9, no. 9 (1999): 2051–80. http://dx.doi.org/10.1039/a903273h.

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Анотація:
We have studied the frustration between ferro- and antiferro-electricity in chiral smectic C like liquid crystalline phases, which is not only fundamentally interesting but also very attractive from an application point of view. It causes temperature induced successive phase transitions as characterized by a devil's staircase and the thresholdless, hysteresis-free, V-shaped switching induced by an applied electric field. The devil's staircase indicates some type of interlayer ordering, while the V-shaped switching suggests considerably diminished tilting correlation. These two are apparently contradictory to each other, but result from the same cause, i.e. the frustration. We have first summarized experimental facts regarding subphases and successive phase transitions observed in many compounds and mixtures, which we believe are related to one another and result from the frustration. We have introduced several different theoretical explanations for these observed facts, and shown that only the axial next nearest neighbor Ising (ANNNI) model can explain almost all of the facts, provided that it is unified with the XY model appropriately. The unified model can make a comprehensive explanation in the most natural way based on the most probable molecular interactions. We have then emphasised that there are several modes regarding the V-shaped switching, because the system becomes so soft with respect to the tilting direction and sense that any additional external or internal force modifies the in-plane local director alignments. For the practically usable ones, we have emphasised the need for some type of randomization in the molecular alignment at the tip of the V and/or the switching process. In particular, the two dimensional (ideally, cylindrically symmetric) azimuthal angle distribution of local in-plane directors around the smectic layer normal is most attractive. Such a randomized state at the tip of the V is thermodynamically unique under a given condition imposed by interfaces. It stays stable even when the smectic layer structure, such as a chevron, changes with temperature. Finally, we have summarized the so-far reported compounds and mixtures for the V-shaped switching and introduced some prototypes of LCDs using them.
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Дисертації з теми "Ferro-electricity"

1

Silva, Rui Miguel Abreu Vilarinho da. "Magnetically-Induced Ferro electricity Unraveled Through Spin-Phonon Coupling." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/69225.

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2

Silva, Rui Miguel Abreu Vilarinho da. "Magnetically-Induced Ferro electricity Unraveled Through Spin-Phonon Coupling." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/69225.

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Книги з теми "Ferro-electricity"

1

Dalal, Naresh, and Annette Bussmann-Holder. Ferro- and Antiferroelectricity: Order/Disorder Versus Displacive. Springer London, Limited, 2007.

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2

Dalal, Naresh, and Annette Bussmann-Holder. Ferro- and Antiferroelectricity: Order/Disorder Versus Displacive. Springer Berlin / Heidelberg, 2010.

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