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Karpov, I. V.
Investigation of the process of structural modification of UHMWPE with CuO nanoparticles on the frequency and temperature dependence of the dielectric characteristics of the composite / I. V. Karpov, L. F. Fedorov, N. A. Drokin // IEEE Trans. Dielectr. Electr. Insul. - 2025, DOI 10.1109/TDEI.2025.3548971. - Cited References: 34. - The work has been performed under the state assignment FWES-2024-0026 . - Article in press. - ISSN 1070-9878. - ISSN 1558-4135
Кл.слова (ненормированные):
vacuum arc discharge -- nanocomposites -- copper oxide -- impedance -- dielectric properties
Аннотация: Using vacuum-arc synthesis, Ultra-high molecular weight polyethylene (UHMWPE)/nano CuO composite samples with a CuO nanoparticle content of 0 to 3 wt.% were obtained. It was found that with an increase in the concentration of nanoparticles, their agglomeration is possible. In addition, with an increase in the concentration of CuO nanoparticles, and accordingly an increase in the time of the polymer modification process, some of the non-polar groups ˃ CH2 are converted into polar groups ˃ C=O, which are easily embedded in the UHMWPE crystal lattice. The electrical properties of pure UHMWPE and UHMWPE/CuO composites were studied by impedance spectroscopy in the frequency range from 102 to 108 Hz and temperatures from 300 K to 420 K. It was found that the dielectric properties of the composite with a CuO nanoparticle content of up to 1 wt.% do not undergo any special changes. The permittivity does not depend on frequency, while the dielectric losses are associated only with through conductivity. With increasing temperature, due to thermal expansion of the polymer and a decrease in its density, the permittivity decreases. With an increase in the nanoparticle content from 2 to 3 wt.% at a frequency of 106 Hz, dielectric relaxation in UHMWPE/nano CuO associated with the formation of polar groups is observed. With increasing temperature, dipole polarization is activated. As a result, dielectric losses increase.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russia
Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Fedorov, L. F.; Drokin, N. A.; Дрокин, Николай Александрович
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Doroshenko, A. P.
Current distribution in a single-ply coil with conducting "insulation" / A. P. Doroshenko // Tech. Phys. - 1997. - Vol. 42, Is. 11. - P. 1329-1332, DOI 10.1134/1.1258871. - Cited References: 14 . - ISSN 1063-7842

РУБ Physics, Applied

Аннотация: A coil made of a continuous rectangular conductor in the form of a single-layer cylindrical helix is analyzed to identify methods of improving the mechanical strength and energy efficiency of resistive systems for producing high magnetic fields with quasi-force-free windings. A characteristic feature of this helix is that the interturn insulation is replaced by a conductor of higher resistivity. An analysis is made of the direction of the resultant current density vector as a function of the ratio of the resistivities of the conductors and the winding angle. It is shown that in principle, the direction of this vector may be arbitrarily defined, by suitably selecting the resistivities of the conductors. In this case, the winding angle may be arbitrarily small. It is demonstrated that these helices will have a high mechanical strength, and when used in quasi-force-free windings they can appreciably reduce the axial current density, which helps to minimize the mechanical stresses and thereby improve the energy efficiency. (C) 1997 American Institute of Physics. [S1063-7842(97)01811-4].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
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Prediction of the in-gap states above the top of the valence band in undoped insulating cuprates due to the spin-polaron effect / S. G. Ovchinnikov [et al.] // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 8. - P. L93-L100, DOI 10.1088/0953-8984/16/8/L04. - Cited References: 25 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   LA2-XSRXCUO4
   MODEL
   ANTIFERROMAGNETISM
   SPECTRA
   OXIDES
Кл.слова (ненормированные):
Quasiparticle band structure -- Spin-polaron effect -- Antiferromagnetic materials -- Approximation theory -- Doping (additives) -- Electronic structure -- Hamiltonians -- Insulation -- Magnetic fields -- Strontium compounds -- Thermal effects -- Lanthanum compounds
Аннотация: In the framework of the generalized tight binding method we have calculated the quasiparticle band structure and the spectral functions of the undoped cuprates such as La2CuO4, Sr2CUO2Cl2 etc. Due to spin fluctuations the in-gap state appears above the top of the valence band in the undoped antiferromagnetic insulator similar to in-gap states induced by hole doping. In the ARPES experiments the in-gap states can be detected as weak low energy satellites.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Borisov, A. A.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович
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