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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : A study of the microwave dielectric permittivity of liquid crystals in electric and magnetic fields
Место публикации : Tech. Phys. - 1998. - Vol. 43, Is. 1. - P.105-109. - ISSN 1063-7842, DOI 10.1134/1.1258946
Примечания : Cited References: 8
Аннотация: A microwave detector based on a self-sustained oscillator circuit is proposed as a means to investigate the real and imaginary components of the dielectric permittivity of liquid crystals in external electric and magnetic fields. Results are given for measurements of a 500 MHz oscillator frequency for two types of nematic crystals, 5CBP and MBBA. Fundamental regularities are identified in the behavior of the microwave dielectric permittivity of samples in electric and magnetic fields. It is shown that the minimum of the high-frequency dielectric loss in liquid crystals correspond to a situation in which the long axes of the molecules are oriented parallel to the direction of the microwave electric field. (C) 1998 American Institute of Physics. [S1063-7842(98)02201-6].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Behavior of high-friequency dielectric spectra of liquid crystals nCB and nOCB
Место публикации : Proc. of SPIE. - 2002. - Vol. 4759. - P.282-284. - ISSN 0277-786X. - ISSN 978-0-81948-566-3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Dielectric and optical properties of a 5-propyl-2-(p-cyanophenyl)-pyridine liquid crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 4. - P797-801. - ISSN 1063-7834, DOI 10.1134/1.1569024
Примечания : Cited References: 12
Предметные рубрики: DECIMETER WAVELENGTH RANGE
SERIES
SPECTRA
5CB
Аннотация: The temperature dependences of the dielectric and optical parameters for a 5-propyl-2-(p-cyanophenyl)-pyridine (3CP) liquid crystal are investigated in the vicinity of the nematic-isotropic phase transition. The dielectric spectra of the 3CP compound in the crystalline, nematic, and isotropic phases are measured in the frequency range 1-1000 MHz, and the Debye approximations of the measured spectra are obtained. Analysis of the dependence of the static permittivity on the director orientation with respect to the direction of the electric pump field demonstrates that the angle between the dipole moment and the long axis of the molecule is approximately equal to 15degrees. (C) 2003 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Dielectric relaxation of trans-4-propyl-(4-cyanophenyl)-cyclohexane liquid crystals
Разночтения заглавия :авие SCOPUS: Dielectric Relaxation of trans-4-Propyl-(4-Cyanophenyl)-Cyclohexane Liquid Crystals
Место публикации : Phys. Solid State. - 2004. - Vol. 46, Is. 3. - P.579-583. - ISSN 1063-7834, DOI 10.1134/1.1687882
Примечания : Cited References: 11
Аннотация: The frequency dependences of the permittivity of a trans-4-propyl-(4-cyanophenyl)-cyclohexane (3PCH) liquid crystal in the nematic phase are measured in the frequency range 1-2000 MHz for different orientations of the director of liquid-crystal molecules with respect to the polarization of an ac electric field. The temperature dependences of the dielectric and optical characteristics are compared in the range of the transition from the nematic phase to the isotropic liquid phase. The dielectric spectra are approximated numerically, and the times of dipole relaxation upon rotation of the molecules about the short and long axes are determined. It is demonstrated that intramolecular motions make a significant contribution to the relaxation. The activation enthalpies are calculated. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Distribution function of relaxation times for a 4-n-pentyl-4 '-cyanobiphenyl liquid crystal
Разночтения заглавия :авие SCOPUS: Distribution function of relaxation times for a 4-n-pentyl-4′- cyanobiphenyl liquid crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 9. - P1791-1796. - ISSN 1063-7834, DOI 10.1134/1.2045369
Примечания : Cited References: 15
Предметные рубрики: DIELECTRIC-RELAXATION
SPECTRA
INVERSION
Аннотация: The distribution function of relaxation times is reconstructed from the dielectric loss spectrum measured over a wide range of frequencies for a 4-n-pentyl-4'-cyanobiphenyl (5CB) liquid crystal. It is demonstrated that the distribution function for the isotropic and nematic phases is asymmetric in shape. Comparison shows that the reconstructed distribution function is in qualitative agreement with similar functions that are analytically derived from the Cole-Davidson and Havriliak-Negami empirical equations. The specific features observed in the behavior of the distribution function with a variation in the angle between the direction of polarization of a microwave electric field and the director of the liquid-crystal molecules are analyzed. A complex dependence of the permittivity for the liquid crystal in the range of ultrahigh frequencies is explained in terms of additional relaxation mechanisms associated with different motions of molecular fragments of alkyl chains. (c) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A.
Заглавие : Impedance spectra of thin permalloy films with a nanoisland structure
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 2. - P.360-367. - ISSN 1063-7834, DOI 10.1134/S1063783412020084
Примечания : Cited References: 20. - This study was supported by the Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Human Resources for the Innovative Russia in 2009-2013," the Siberian Branch of the Russian Academy of Sciences (Integration research project no. 5), and the Presidium of the Russian Academy of Sciences (project no. 21.1).
Предметные рубрики: CAPACITANCE
Аннотация: The behavior of the impedance spectra of island permalloy films prepared through vacuum evaporation onto optically polished glass-ceramic substrates has been investigated in the frequency range from 0.0001 to 100 MHz. A resistor-capacitor model of the films has been developed and the model parameters, for which there is a good agreement with experimental data on the frequency dependences of the real and imaginary components of the impedance, have been determined. The specific features in the behavior of the electrical and physical characteristics with variations in the thickness of the sample and the gap between the measuring electrodes have been investigated. It has been found that the relative permittivity of the films under investigation reaches values E similar to 10(7)-10(8). The structural relaxation times have been calculated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A.
Заглавие : Impedance spectroscopy investigation of electrophysical characteristics of the electrode-liquid crystal interface
Коллективы : Siberian Branch of the Russian Academy of Sciences [109]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 1. - P.181-187. - ISSN 1063, DOI 10.1134/S1063783415010060. - ISSN 10906460(eISSN)
Примечания : Cited References:22. - This study was supported by the Siberian Branch of the Russian Academyof Sciences (integration project no. 109).
Предметные рубрики: DIELECTRIC-PROPERTIES
CONDUCTIVITY
Аннотация: The behavior of frequency dependences of the impedance of a capacitive measuring cell with a liquid crystal has been investigated in the frequency range from 10−1 to 105 Hz. A method for determining electrophysical characteristics of the liquid crystal in the bulk and at the liquid crystal-metal electrode interface has been proposed and tested for liquid crystals of the alkyl cyanobiphenyl series, which are doped with ionic surfactants. The method is based on the use of an equivalent electrical circuit, which makes it possible to approximate the impedance spectra with the required accuracy, and also on the determination of the frequency at the singular point in the impedance spectra, at which the reactive component of the electric current flowing through the liquid-crystal cell is negligible compared to the active component.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Maslennikov A. N.
Заглавие : Impedance spectroscopy investigation of liquid crystals doped with ionic surfactants
Коллективы : Siberian Branch of the Russian Academy of Sciences [109]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 7. - P.1455-1462. - ISSN 1063-7834, DOI 10.1134/S106378341407004X. - ISSN 1090-6460
Примечания : Cited References: 20. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (integration project no. 109).
Аннотация: The effect of a direct-current (dc) electric field on the electrophysical characteristics of nematic liquid crystals of the alkyl cyanobiphenyl series nCB (n = 6-8) and the multicomponent liquid-crystal mixture MB-1, which are doped with ionic surfactants, has been investigated using impedance spectroscopy. It has been found that the impedance spectra depend substantially on the dc bias voltage applied to the sample. The approximation of the measured spectra with specially developed equivalent circuits of the measuring cell with a sample has made it possible to determine the capacitance of the electric double layer and the electrical conductivity of the samples, as well as the mobility, concentration, and diffusion coefficient of the ions. It has been shown that a region of the space charge is formed in the frequency range f ˂ 100 Hz near the electrodes of the measuring cell with a liquid-crystal sample, which leads to an increase in the active (resistive) and reactive (capacitive) components of the impedance.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Poluboyarov V. A.
Заглавие : Impedance spectroscopy study of the electrical properties of cation-substituted barium hexaaluminate ceramics
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 2. - P.274-280. - ISSN 1063-7834, DOI 10.1134/S1063783418020063. - ISSN 1090-6460(eISSN)
Примечания : Cited References:18
Предметные рубрики: DIELECTRIC-RELAXATION
LIQUID-CRYSTALS
SPECTRA
Аннотация: We report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe2O3 · 4Al2O3). The measurements have been performed in the frequency range of 0.5–108 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Reconstruction of the distribution function of relaxation times for 7CB and 7OCB liquid crystals from dielectric spectra
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 5. - P973-978. - ISSN 1063-7834, DOI 10.1134/S106378340605026X
Примечания : Cited References: 16
Предметные рубрики: DECIMETER WAVELENGTH RANGE
FEATURES
Аннотация: A technique for reconstructing the distribution function of relaxation times from the dielectric spectra measured over a wide range of frequencies is proposed and tested using 7CB and 7OCB liquid crystals as examples. The objective function, which is the sum of the squares of the differences between the calculated and measured permittivities, is minimized with the Mathcad program package. It is demonstrated that, in the case of parallel orientation of the molecular director with respect to the polarization of the ac electric field, the distribution function of relaxation times is consistent with the Debye relaxation model; however, there are insignificant deviations in the short-time interval corresponding to the high-frequency portion of the dielectric spectrum. For perpendicular orientation of the director, the distribution function of relaxation times exhibits specific features that are most pronounced for the 7OCB liquid crystal and probably reflect intramolecular motions of the rigid core and fragments of the alkyl chain.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Temperature dependence of the dielectric characteristics of a 5CB liquid crystal within the relaxation region
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 4. - P765-768. - ISSN 1063-7834, DOI 10.1134/1.1913994
Примечания : Cited References: 9
Предметные рубрики: SERIES
Аннотация: The temperature dependence of the real part of the permittivity of a 4-n-pentyl-4-cyanobiphenyl liquid crystal was studied within a broad frequency range of 30-5000 MHz and in the temperature interval 20-60 degrees C in the vicinity of the nematic-isotropic-liquid phase transition. It was established that the dispersion of the longitudinal component of the permittivity can be fitted well by a sum of two Debye terms with strongly differing relaxation times. The temperature and frequency dependence of the shorter relaxation time was determined for which the best fit between calculations and experiment was achieved. (C) 2005 Pleiades Publishing, Inc.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Kiiko V. S., Pavlov A. V., Malkin A. I.
Заглавие : BT-30 Ceramic Electrophysical Properties
Место публикации : Refract. Ind. Ceram. - 2020. - Vol. 61, Is. 3. - P.341-348. - ISSN 1083-4877 (ISSN), DOI 10.1007/s11148-020-00484-2. - ISSN 1573-9139 (eISSN)
Примечания : Cited References: 12
Аннотация: A total complex resistance (impedance) method is used to study the electrophysical characteristics of (BeO + TiO2)-ceramics modified with TiO2 micro- and nanoparticles in an amount of 30 wt.% (BT-30). Dispersion of the actual ε′ and imaginary ε′′ components of the dielectric permittivity component and specific conductivity in the frequency range from 100 Hz to 100 MHz from room temperature to the boiling point of liquid nitrogen are determined. High values of ε′ and ε′′ in the low-frequency range are typical for structurally inhomogeneous materials due to the accumulation of electric charges at the surface and within microcrystals. Two dielectric relaxation processes associated with electrical conductivity within the body and at the surface of ceramics are detected for the first time. An increase in conductivity with an increase in the microwave field frequency above 1 MHz is explained by the appearance of a current relaxation component. The activation energy of the static resistance of ceramic specimens is determined as a function of the reciprocal temperature that depends little on the weight content of TiO2 nanoparticles and varies in the range of 0.024 – 0.10 eV This also confirms the existence of two independent conduction processes, weakly dependent on the nanoparticle content in the ceramic composition. With placement of ceramic in a high-frequency electric field, spatial charges are formed, the field of which contributes to creation of additional polarization and dielectric losses.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Maslennikov A. N., Glushchenko G. A., Drokin N. A.
Заглавие : Composites based on superhigh-molecular poly(ethylene) and carbon nanostructures
Коллективы : "Advanced Carbon Nanostructures", Joint International Conference, Красноярский государственный педагогический университет им. В.П. Астафьева
Место публикации : Joint International Conference "Advanced Carbon Nanostructures" (ACN 2011): Abstracts. - 2011. - Ст.P6.08. - С. 324
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Dielectric anisotropy of 5CB liquid crystal in a decimeter wavelength range
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 3. - P577-579. - ISSN 1063-7834, DOI 10.1134/1.1131251
Примечания : Cited References: 7
Аннотация: Parallel and perpendicular components of the dielectric constant for 5CB nematic liquid crystal are measured in a relaxation region. Two frequencies f(1) approximate to 30 and f(2) approximate to 350 MHz are determined at which the inversion of the dielectric anisotropy sign is observed. It is shown that the observed sizable high-frequency shift of f(2) with respect to the value calculated according the Debye theory is caused by the dielectric resonance near the relaxation region. (C) 2000 MAIK "Nauka/Interperiodica".
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Dielectric anisotropy of nematic 4-pentil-4'-cyanobiphenyl
Место публикации : Molecular crystals and liquid crystals science and technology : section A- Molecular crystals and liquid crystals. - 2001. - Vol. 366, Is. 1. - P.305-312. - DOI 10.1080/10587250108023973
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Kumakhov M. A., Shabanov V. F.
Заглавие : Dielectric properties of liquid crystals in polycapillary matrices
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 6. - P1315-1322. - ISSN 1063-7834, DOI 10.1134/S1063783410060314
Примечания : Cited References: 24. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3) and the Siberian Branch of the Russian Academy of Sciences (Integration Project no. 5) and performed within the framework of the State Contract (no. 02.740.11.0220).
Предметные рубрики: MOLECULAR-SIEVES
SILICA AEROGEL
POROUS-GLASS
MEMBRANES
NMR
8CB
Аннотация: This paper reports on the results of investigations into the dielectric properties of liquid crystals embedded in polycapillary matrices and describes a technique for their measurement. It has been revealed that the chemical structure of the rigid core and the length of mobile alkyl groups of liquid-crystal molecules of the alkylcyanobiphenyl group substantially affect the equilibrium configuration of the liquid-crystal director in capillaries. The reorientation of liquid-crystal molecules embedded in capillaries in the nematic phase under the influence of an external magnetic field has been investigated.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Baranova V. A.
Заглавие : Dielectric properties of liquid crystals of the cyano derivative compounds with different fragments in the molecular core
Разночтения заглавия :авие SCOPUS: Dielectric properties of liquid crystals of the cyano derivative compounds with different fragments in the molecular core
Место публикации : Phys. Solid State. - 2004. - Vol. 46, Is. 3. - P.574-578. - ISSN 1063-7834, DOI 10.1134/1.1687881
Примечания : Cited References: 13
Аннотация: This paper reports on the results of investigations into the influence of variations in the chemical composition of the aromatic core of cyano-containing molecules of liquid crystals on their dielectric properties in the frequency range 1-2000 MHz. It is shown that the dispersion of the longitudinal permittivity is adequately described by the sum of two Debye processes with different weighting factors and relaxation times. The frequency dependence of the transverse permittivity is well approximated by the Debye process with a continuous distribution of relaxation times in a specified range. It is established that the replacement of one benzene ring in the biphenyl core of the 5CB liquid-crystal molecule by a cyclohexane (or bicyclooctane) fragment leads to a considerable decrease in both relaxation times for the longitudinal permittivity, a change in the low-frequency limit of the relaxation time range for the transverse permittivity, and the evolution of the frequency dependence of the dielectric anisotropy. (C) 2004 MAIK "Nauka / Interperiodica".
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Ovchinnikov S. G., RYABINKINA L. I.
Заглавие : PHOTOCONDUCTIVITY OF ALPHA-MNS AND MNO
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1987. - Vol. 29, Is. 6. - P1625-1628. - ISSN 0367-3294
Примечания : Cited References: 10
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Ovchinnikov S. G.
Заглавие : Properties of nonmagnetic-fe3o4 magnetic semiconductor heterostructure in metal-dielectric junctions
Место публикации : Zhurnal Tek. Fiz. - 1991. - Vol. 61, Is. 6. - P.201-203. - ISSN 0044-4642
Примечания : Cited References: 5
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Ganiev S. M.
Заглавие : Static and dynamic characteristics of the bulk and contact electric resistivity in CDCR2SE4 under stochastic current instability
Место публикации : Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P.2122-2128. - ISSN 0367-3294
Примечания : Cited References: 21
Предметные рубрики: OSCILLATIONS
CHAOS
GE
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