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Fuel, 2001
Dielectric measurements of UK coals have shown that electric permittivity decreases with coal rank (dry, mineral free basis), however, the moisture and mineral matter content may increase the bulk coal electric permittivity. Electric permittivity increases with low rank coals as a result of increasing moisture levels associated with low rank coals. The
A Merchant, S Marland, Neil A. Rowson
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Dielectric measurements of UK coals have shown that electric permittivity decreases with coal rank (dry, mineral free basis), however, the moisture and mineral matter content may increase the bulk coal electric permittivity. Electric permittivity increases with low rank coals as a result of increasing moisture levels associated with low rank coals. The
A Merchant, S Marland, Neil A. Rowson
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Dielectric properties of Pb5Al3F19
Journal of Fluorine Chemistry, 1991Abstract The tetragonal A 5 M 3 F 19 compounds (A = Sr,Ba,Pb; M = Al,Ti,V, Cr,Fe,Ga) and with the Pb 5 Cr 3 F 19 -type structure undergo a first order transition without change of crystalline system at 285 ≲ T c ≲ 1090 K [1,2]. The transition temperature depends strongly on the nature of the A 2+ and M 3+ cations.
Paul Hagenmuller +4 more
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The dielectric properties of rubber
Proceedings of the IEE - Part IIA: Insulating Materials, 1953The paper describes the results of measurements of the power factor and relative permittivity of purified, uncompounded, natural rubber within the temperature range from -50 to +40° C and within the frequency range from 50c/s to 1 Mc/s. The effect of exposure to water vapour on the dielectric properties is contrasted with the effect of a similar ...
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Dielectric properties of FeTiO3
Physica Status Solidi (a), 1991FeTiO3 powder is prepared from aqueous solution (wet method). Magnetic properties of the sample are the same as those of FeTiO3 prepared by calcination. Dielectric properties of the powder are investigated from 4.2 K to room temperature. There are two dielectric relaxations in the low temperature region. One is observed near 52 K and the other at 118 K.
M. Kiyama, T. Nakamura, K. Iwauchi
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Dielectric properties of aerogels
Journal of Materials Research, 1993We have measured the real (dielectric constant) and imaginary (loss factor) components of the complex relative permittivity at 298 K using microwave frequencies (2, 10, and 18–40 GHz) for bulk SiO2-aerogels and for two types of organic aerogels, resorcinol-formaldehyde (RF) and melamine-formaldehyde (MF). Measured dielectric constants are found to vary
Lawrence W. Hrubesh +2 more
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1989
Of the many physical methods which can be used to study polymers in their bulk or solution states those involving the mechanical and electrical properties have been prominent. The need for data on the mechanical properties is evident since most applications of synthetic polymers require the materials to be strong, tough and mechanically stable.
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Of the many physical methods which can be used to study polymers in their bulk or solution states those involving the mechanical and electrical properties have been prominent. The need for data on the mechanical properties is evident since most applications of synthetic polymers require the materials to be strong, tough and mechanically stable.
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Journal of Molecular Liquids, 1992
Abstract A simple model is proposed to describe excess dielectric properties that is based on the additivity of electrical susceptibilities of species in a mixture. Since this requires a definition for the ideal dielectric behavior of a liquid mixture, a thermodynamicaly ideal mixture was considered to be under the effect of an applied electrical ...
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Abstract A simple model is proposed to describe excess dielectric properties that is based on the additivity of electrical susceptibilities of species in a mixture. Since this requires a definition for the ideal dielectric behavior of a liquid mixture, a thermodynamicaly ideal mixture was considered to be under the effect of an applied electrical ...
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Dielectric properties of cyanoethylcellulose
1957 Conference on Electrical Insulation, 1957Previously reported measurements on the high dielectric constant polymer, cyanoethylcellulose, (C. W. Lewis and D. H. Hogle, J. Polymer Science 21, 411 (1956).) have been extended to a wide temperature range with material of three different degrees of substitution.
D. H. Hogle +2 more
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Dielectric properties of polymonochlorotrifluoroethylene
Journal of Polymer Science, 1958AbstractThe dielectric properties of three kinds of polymonochlorotrifluoroethylene having various degrees of crystallinity were studied. The measuring instruments by which the dielectric properties can be measured over a wide range of frequency are briefly described.
Tatsuji Nakajima, Shogo Saito
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The dielectric properties of mica
Proceedings of the Physical Society of London, 1924Two methods used for determining the dielectric constant of thin sheets of mica are described and the errors discussed. The results of measurements on over 170 sheets of mica are given. The samples tested included best clear mica, ruby, green and brown in colour, stained and spotted samples, and also samples with gaseous inclusions.
D W Dye, L Hartshorn
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