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A study of the microwave dielectric permittivity of liquid crystals in electric and magnetic fields / B. A. Belyaev [et al.] // Tech. Phys. - 1998. - Vol. 43, Is. 1. - P. 105-109, DOI 10.1134/1.1258946. - Cited References: 8 . - ISSN 1063-7842
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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Публикация на русском языке Исследование СВЧ диэлетрической проницаемости жидких кристалов в электрических и магнитных полях [Текст] / Б. А. Беляев, Н. А. Дрокин, В. Ф. Шабанов, В. Н. Шепов // Журнал технической физики. - 1998. - Т. 68 Вып. 1. - С. 117-122

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Dept, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Physics Institute, Siberian Department, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Shepov, V. N.; Шепов, Владимир Николаевич
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BELYAEV, B. A.
APPLICATION OF MICRO-STRIP RESONATORS IN THE INVESTIGATION OF DIELECTRIC-PROPERTIES OF LIQUID-CRYSTALS ON UHF / B. A. BELYAEV, N. A. DROKIN, V. N. SHEPOV // Zhurnal Tek. Fiz. - 1995. - Vol. 65, Is. 2. - P. 189-197. - Cited References: 14 . - ISSN 0044-4642

РУБ Physics, Applied

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Доп.точки доступа:
DROKIN, N. A.; SHEPOV, V. N.
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Behavior of high-friequency dielectric spectra of liquid crystals nCB and nOCB / B. A. Belyaev, N. A. Drokin, V. F. Shabanov, V. N. Shepov // Proc. of SPIE. - 2002. - Vol. 4759. - P. 282-284 . - ISSN 0277-786X. - ISSN 978-0-819

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Shepov, V. N.; Шепов, Владимир Николаевич
}
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BT-30 Ceramic Electrophysical Properties / N. A. Drokin, V. S. Kiiko, A. V. Pavlov, A. I. Malkin // Refract. Ind. Ceram. - 2020. - Vol. 61, Is. 3. - P. 341-348, DOI 10.1007/s11148-020-00484-2. - Cited References: 12 . - ISSN 1083-4877. - ISSN 1573-9139
Кл.слова (ненормированные):
(BeO + TiO2)-ceramic -- electrophysical properties -- electrical resistance activation energy
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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Держатели документа:
FGBOU VO Academician M. F. Reshetnev Siberian Aerospace University, Krasnoyarsk, Russia.
FGBUN Federal Research Center, Krasnoyarsk Scientific Center of the Siberian Section, Russian Academy of Sciences, Krasnoyarsk, Russia.
FGAOU VO Ural Federal University, Ekaterinburg, Russia.
FGAOU VO Siberian Federal University, Krasnoyarsk, Russia.

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Kiiko, V. S.; Pavlov, A. V.; Malkin, A. I.
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Composites based on superhigh-molecular poly(ethylene) and carbon nanostructures / G. N. Churilov, I. V. Osipova, A. N. Maslennikov [et al.] ; // Joint International Conference "Advanced Carbon Nanostructures" (ACN 2011) : Abstracts. - 2011. - Ст. P6.08. - P324

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Доп.точки доступа:
Churilov, G. N.; Чурилов, Григорий Николаевич; Osipova, I. V.; Осипова, Ирина Владимировна; Maslennikov, A. N.; Масленников, Алексей Николаевич; Glushchenko, G. A.; Глущенко, Гарий Анатольевич; Drokin, N. A.; Дрокин, Николай Александрович; "Advanced Carbon Nanostructures", Joint International Conference(2011 ; July ; 4-8 ; St Petersburg); Красноярский государственный педагогический университет им. В.П. Астафьева
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Belyaev, B. A.
Dielectric and optical properties of a 5-propyl-2-(p-cyanophenyl)-pyridine liquid crystal / B. A. Belyaev, N. A. Drokin, V. F. Shabanov // Phys. Solid State. - 2003. - Vol. 45, Is. 4. - P. 797-801, DOI 10.1134/1.1569024. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Беляев, Борис Афанасьевич
}
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Dielectric anisotropy of 5CB liquid crystal in a decimeter wavelength range / B. A. Belyaev [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 3. - P. 577-579, DOI 10.1134/1.1131251. - Cited References: 7 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Shepov, V. N.; Шепов, Владимир Николаевич
}
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Dielectric anisotropy of nematic 4-pentil-4'-cyanobiphenyl / B. A. Belyaev, N. A. Drokin, V. F. Shabanov, V. N. Shepov // Molecular crystals and liquid crystals science and technology : section A- Molecular crystals and liquid crystals. - 2001. - Vol. 366, Is. 1. - P. 305-312DOI 10.1080/10587250108023973

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Shepov, V. N.
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Dielectric properties of liquid crystals in polycapillary matrices / B. A. Belyaev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 6. - P. 1315-1322, DOI 10.1134/S1063783410060314. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Belyaev, B. A.
Drokin, N. A.
Shabanov, V. F.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kumakhov, M. A.] Inst Xray Opt, Moscow 125315, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Institute of X-Ray Optics, ul. Chasovaya 28, Moscow 125315, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Kumakhov, M. A.; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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10.

Dielectric properties of liquid crystals of the cyano derivative compounds with different fragments in the molecular core / B. A. Belyaev [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 3. - P. 574-578, DOI 10.1134/1.1687881. - Cited References: 13 . - ISSN 1063-7834
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович; Baranova, V. A.
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