Results 221 to 230 of about 11,325 (265)
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Optik, 2018
Abstract Relaxor ferroelectric crystals PMN-32PT:Ho were prepared by using the flux method. Phase structure and surface morphology of the crystals were performed by using the X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), respectively.
Haibo Yu +6 more
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Abstract Relaxor ferroelectric crystals PMN-32PT:Ho were prepared by using the flux method. Phase structure and surface morphology of the crystals were performed by using the X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), respectively.
Haibo Yu +6 more
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Properties of Ferroelectric Liquid Crystals
SPIE Proceedings, 1986Certain 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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Impurities and ferroelectric properties of semiconductors
Ferroelectrics, 1978Within the framework of the vibronic theory of ferroelectric semiconductors the influence of impurity carriers on the ferroelectric properties of the crystal is investigated with the width of the allowed electron bands taken into account. A possibility of a significant shift of the Curie point and a modification of the form of the dependence of the low-
P. Konsin, N. Kristoffel
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Dynamic properties of relaxor ferroelectrics
Journal of Applied Physics, 1999We calculate the dynamic order parameter and dielectric susceptibility for the relaxor ferroelectrics like PbMg1/3Nb2/3O3, PbSc1/2Ta1/2O3 and Pb1−xLaxZryTi1−yO3. Calculations of temperature and frequency dependence of dielectric susceptibility show the existence of low- and high-temperature group of maxima obeyed to Vogel–Fulcher (VF) and Arrhenius ...
M. D. Glinchuk, V. A. Stephanovich
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Dielectric properties of microcomposite ferroelectrics
Phase Transitions, 1999Abstract The dielectric response in two-phase composites of ferroelectric and dielectric materials was studied within the quasistatic approximation. Using different effective medium theories (Maxwell-Garnet theory, the effective medium approximation and the Bergman representation) the dielectric function was represented as a distribution of polar modes.
I. Rychetský, O. Hudák, J. Petzelt
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Ferroelectric properties in aromatic polyamides
Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94), 2002On 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 +3 more
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Ferroelectric properties of pyridinium periodate
The Journal of Chemical Physics, 1998Polycrystalline pyridinium periodate has been studied over a wide range of temperature by differential thermal analysis, proton nuclear magnetic resonance (NMR) spectra and relaxation and complex dielectric permittivity measurements. Two solid-solid phase transitions at 210 and 323 K have been revealed and the pyridinium cation reorientation in all ...
Z. Pająk +3 more
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Piezoelectric properties of a ferroelectric ceramic
Strength of Materials, 19841. The laser interferometer that was developed has a resolving power of 30 A and ensures an error no greater than 0.05% for the measurement of quasistatic strains, which makes it possible to use the interferometer to study the physicomechanical properties of lowductility ceramics. 2.
V. A. Kuz'menko +3 more
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Ferroelectric properties of pyridinium perchlorate
Journal of Physics: Condensed Matter, 1994Polycrystalline 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 +3 more
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Polar properties of a mesoscopic ferroelectric
Ferroelectrics, 1997Abstract At the 1995 Williamsburg workshop we reported[3] on the condensation of polar nanoregions in KTa1−x Nb x O3 approximately 20 K above the actual ferroelectric transition for Nb concentrations ranging from 1.2% to 30%. We have now studied the novel polar properties to which these nanoregions give rise.
R. K. Pattnaik, J. Toulouse
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