Results 151 to 160 of about 63,457 (174)

Ferroelectric properties in aromatic polyamides

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94), 2002
On the basis of the ferroelectric behavior found for quenched or less-crystalline polyamides, ferroelectric properties were investigated for amorphous polyamides constituted of polymethylenediamines and isophthalic acid (I) which were designated as 6I, 9I, and 12I in accordance with the number of carbon atom in diamines and copolyamides of ...
Y. Murata, K. Tsunashima, J. Umemura, N. Koizumi   +3 more
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Enhancement of dielectric and ferroelectric properties in ferroelectric superlattices

Solid State Communications, 2010
Abstract I studied theoretically the enhancement of remanent polarization and dielectric permittivity of interfacial-coupled ferroelectric superlattices based on the Landau–Ginzburg theory. Our model adopts the Landau–Khalatnikov equation to describe hysteresis behavior and takes the time-dependent space-charge-limited conductivity into account to ...
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Properties of Ferroelectric Liquid Crystals

SPIE Proceedings, 1986
Certain smectic liquid-crystalline mesophases of chiral materials have been shown to exhibit both ferroelectric and pyroelectric properties. Consequently, these phenomena have recently been evaluated for their device potential. For example, these modifications have been proposed for use in displays, heat sensors, linear arrays, and spatial light ...
J. W. Goodby, J. S. Patel
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Properties of new ferroelectric materials

Liquid Crystals, 1989
Abstract A homologous series of chiral 4-(3-methylpentyl)benzenethio-4′-n-alkoxy-benzoates has been studied. These thioesters display a ferroelectric, chiral smectic C phase in addition to cholesteric and smectic A phases. A comparison is made between the thioester series and a phenylbenzoate, having the same molecular end group.
A. M. Lackner, S. M. Wong, K-C. Lim, J. D. Margerum, M. E. Neubert   +4 more
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Thermodynamical properties of ferroelectric films

Journal of Physics and Chemistry of Solids, 1992
Abstract The elementary excitations in thin ferroelectric films are analysed. It is assumed that the film is deformed only on the boundary surfaces. The dispersion laws of volume as well as the surface excitations are found. The conditions for the surface state's existence are discussed.
Tošić, Bratislav, Sajfert, Vjekoslav, Mirjanić, Dragoljub, Šetrajčić, Jovan   +3 more
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Ferroelectric properties of pyridinium perchlorate

Journal of Physics: Condensed Matter, 1994
Polycrystalline pyridinium perchlorate has been studied over a wide range of temperatures by differential thermal analysis, proton NMR spectra and relaxation, and dielectric permittivity measurements. Two solid-solid phase transitions at 232 and 248 K have been revealed and the pyridinium cation reorientations in all three phases characterized.
P Czarnecki, W Nawrocik, Z Pajak, J Wasicki   +3 more
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Ferroelectric Materials with Photoluminescent Properties

Ferroelectrics, 2003
Amorphous LiNbO 3 thin films processed by polymeric precursor method exhibited efficient luminescence at room temperature. The films were deposited on silicon substrates and treated at 200°C for different times. The photoluminescence emission yield decreases with the increase of the treatment time and disappears for crystalline films.
Bouquet, V, Vasconcelos, NSLS, Aguiar, R., Pinheiro, C. D., Leite, E. R., Pizzani, P. S., Varela, P. A., Longo, Elson, Boschi, T. M., Lanciotti, F., Machado, MAC   +10 more
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Ferroelectric Properties of Lead Titanate

Journal of the American Ceramic Society, 1968
The eutectic and solidus temperatures of the PbTiO 3 ‐KF binary system were investigated by DTA for four compositions. Optical studies of crystal habit as a function of crystallization conditions were used to determine favorable conditions for growing PbTiO 3
V. G. BHIDE, M. S. HEGDE, K. G. DESHMUKH
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Acoustical properties of disordered ferroelectrics

Ferroelectrics, 1990
A short review of acoustic properties of a number of disordered ferroelectric materials is made. In the first place such characteristics as velocity of ultrasound elastic waves and their attenuation in a phase transition range are discussed. We show that rather wide class of compounds (relaxators) can be identified as correlated (cluster) polar glasses.
S. N. Dorogovtsev, N. K. Yushin
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Ferroelectric properties of (C5H5NH)5Bi2Br11

The Journal of Chemical Physics, 2001
A new pyridinium compound, (C5H5NH)5Bi2Br11, has been synthesized. The x-ray diffraction studies indicate that its structure is built up of four independent pyridinium cations and isolated Bi2Br115− groups. At room temperature it crystallizes in the monoclinic space group P21/n.
J. Jóźków, R. Jakubas, G. Bator, A. Pietraszko   +3 more
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