Types of relaxation polarization in dielectrics with higasi relaxator distribution
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In ferroelectric superlattices (SLs), the short-range interactions and intermixing between contacting dissimilar materials can lead to the formation of interfacial nanolayers with physical properties different from those of both constituents. We demonstrate theoretically that such nanolayers can give rise to a sizable dependence of the SL permittivity on the period even in the paraelectric regime. The results of dielectric measurements performed for coherent Ba0.8Sr0.2TiO3–Ba0.4Sr0.6TiO3 SLs are qualitatively consistent with the theoretical predictions. At the same time, the experimental data indicate that other factors also contribute to the variation of the permittivity with the period in ferroelectric superlattices and multilayers.
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AFe 1/2 B 1/2 O 3 (A=Ba , Sr, Ca; B=Nb, Ta, Sb) ceramics were synthesized and temperature dependences of dielectric permittivity were measured at different frequencies. The experimental data obtained show very high values of dielectric permittivity in a wide temperature interval that is inherent to so-called high-k materials. Analyses of these data establish a Maxwell–Wagner mechanism as a main source for the phenomenon observed.
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We present a theory of the dielectric permittivity in which the intermolecular dipole-dipole correlations are treated explicitly. The results for the static permittivity agree with those which have previously been obtained by continuum calculations. The frequency dependence of the permittivity is related to two relaxation times which contain the effects of only short range intermolecular correlations. Approximate relationships are derived between these times and independently measurable properties.
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Huttner and Barnett's interpretationof the function they call ε(ω) as the dielectric permittivity is crucial in practical applications of their theory. We show explicitly that ε(ω) is the permittivity but that their microscopic model can only describe certain types of permittivity.
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Resonance and waveguide methods of measurement of complex permittivity of high absorbing liquid at millimeter wave length are proposed and implemented. The methods are based on the use of electromagnetic wave crossing through a dielectric rod surrounded by an investigated liquid. Coefficients of pair correlation of complex permittivity of wine with its physicochemical parameter were obtained.
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In the paper, for two cases of different ages and different depths, the speed of radar wave transmitted in the testing concrete lining is measured by using the ground penetrating radar (GPR), and corresponding data of permittivity of the concrete lining are therefore obtained. An abnormal phenomenon of the permittivity is observed which shows that the value of permittivity will increase linearly with the depth of the concrete lining. Combined with the characteristics of tunnel lining and taken the free water distribution into account, a new dielectric model of the concrete lining is put forward. Results show that this model can be used to explain the experimental results and provide correct reference for the GPR use in measuring the depth of the concrete lining with good accuracy.
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Abstract The electric permittivity of nematic 44′ n-pentylcyanobiphenyl has been measured in the presence of electric and magnetic fields. Values of the permittivity components for the aligned state have been obtained and analysed in terms of the statistical theory of Maier and Meier. The behaviour of bulk samples of the material in electric and magnetic fields has been investigated, and yielded a mean permittivity for the non-aligned state. The macroscopic behaviour is discussed in terms of the continuum theory. Variable frequency measurements have shown the presence of a dispersion region in ε∥ at about 5 MHz.
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Measurement methods of complex permittivity of dielectric materials from 20 GHz to 3 THz are introduced. The dielectric properties of a liquid crystal polymer were not affected by environmental conditions, thus liquid crystal can become a candidate for insulating materials used in THz communications.
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