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Your search keyword '"Senkevich, S. V."' showing total 130 results
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130 results on '"Senkevich, S. V."'

12. Electrocaloric multilayer capacitors on the base of lead magnesium niobate–lead scandium niobate.

Author

Smirnova, E. P., Sotnikova, G. Yu., Zaitseva, N. V., Senkevich, S. V., Sotnikov, A. V., and Gavrilov, G. A.

Subjects
LEAD titanate, PARTICLE size distribution, PYROELECTRICITY, SCANDIUM, CAPACITORS, MAGNESIUM
Abstract

Electrocaloric and pyroelectric effects of the relaxor 0.55Pb-Mg1/3Nb2/3O3–0.45PbSc1/2Nb1/2O3 (PMN–PSN) bulk and multilayer ceramic (MLC) structures in their connection with the microstructure are reported. The electrocaloric measurements were performed using the mid-infrared radiation (MIR) technique developed and introduced by the authors. The comparison of the electrocaloric temperature change δТ and pyroelectric coefficient p vs temperature dependences of bulk and MLC samples shows a large difference in their temperature behavior. It is shown that significant smearing of these dependences is determined by the microstructure (grain size and grain size distribution) of both bulk and MLC samples. The predicted cooling power of the PMN–PSN MLC can reach Qmax = 1370 mW with reasonable MLC geometry (the number of layers n = 200, the effective length of L = 3.3 mm) and taking into account experimentally obtained δТ = 1.2 °C at a relatively low electric field of 68 kV/cm. Both large values for δТ at ambient temperatures and the estimated cooling power characterize the PMN–PSN MLC as a promising unit for electrocaloric cooling devices. [ABSTRACT FROM AUTHOR]

Published
2020
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21. Ferroelectric properties of lead zirconate titanate thin films obtained by RF magnetron sputtering near the morphotropic phase boundary

Author

null Pronin V. P., null Senkevich S. V., null Pronin I. P., null Kaptelov E. Yu., null Kiselev D. A., null Fedoseev M. L., and null Staritsyn M. V.

Abstract

An experimental study of the crystal structure and ferroelectric properties of -textured lead zirconate titanate films with a fine variation in their composition (with a change in the elemental ratio of zirconium and titanium atoms within 1.5%) near the morphotropic phase boundary revealed jump-like changes in the pseudocubic lattice parameter, dielectric permittivity and residual polarization. It is assumed that the observed anomalies correspond to a morphotropic transition from a rhombohedral to a mixture of tetragonal and monoclinic phases. Keywords: fine composition variation, phase state, piezoresponse force microscopy, abnormal dielectric and piezoelectric properties.

Published
2023
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29. An influence of mechanical stresses on the magnitude of the internal field in lead zirconate titanate thin films

Author

null Pronin V. P., null Nemov S. A., null Pronin I. P., null Senkevich S. V., null Kaptelov E. Yu., and null Valeeva A. R.

Abstract

In self-polarized lead zirconate titanate thin films formed on platinized silicon substrates, a significant increase in the internal electric field was observed as a result of long-term aging. To explain this phenomenon, a mechanism is proposed for the formation of the internal field associated with the diffusion of charged oxygen vacancies, which, in turn, is due to the action of a mechanical stress gradient. The diffusion coefficient of charged oxygen vacancies was estimated to be ~ 3·10-16 cm2/s. Keywords: thin films, lead zirconate titanate, internal field, Gorsky effect.

Published
2022
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43. Investigation of the unipolar and polarized thin PZT films under variation of lead excess

Author

Osipov, V. V., Kaptelov, E. Yu., Senkevich, S. V., Kiselev, D. A., and Pronin, I. P.

Abstract

Целью данной работы является исследование методом атомно-силовой микроскопии естественно униполярных и поляризованных в сильном электрическом поле тонких пленок Pb(Zr,Ti)O3 при варьировании сверх стехиометрического содержания свинца в твердых растворах. The aim of the work is to study the self-poled and polarized thin Pb(Zr,Ti)O3 films under variation of over stoichiometric content lead using piezoelectric force microscopy.

Published
2017

45. The Thermoelectric Power of Bi1 –xSbx Films (0 ≤ x ≤ 0.15) on Mica and Polyimide Substrates in the Temperature Range of 77–300 K.

Author

Suslov, M. V., Grabov, V. M., Komarov, V. A., Demidov, E. V., Senkevich, S. V., and Suslov, A. V.

Subjects
THERMOELECTRIC power, POLYIMIDES, MICA, THERMAL expansion, POLYIMIDE films, TEMPERATURE
Abstract

The results of an investigation into the thermoelectric power of thin block Bi1 –xSbx films (0 ≤ x ≤ 0.15) 100–1000 nm in thickness on mica and polyimide substrates in the temperature range of 77–300 K are presented. When measuring the thermoelectric power, a method excluding strain distortion in the film–substrate system is used. The structure, temperature dependences of the thermoelectric power, and resistivity of thin films are analyzed, and the power factor is estimated. A difference in the character of the temperature dependences of the thermoelectric power and resistivity of the films on mica and polyimide substrates is found. This difference is explained by a variation in the band structure parameters under the effect of strain appearing in the film–substrate system due to a difference in the thermal expansion of the film and substrate materials. [ABSTRACT FROM AUTHOR]

Published
2019
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46. The Band-Structure Parameters of Bi1 –xSbx (0 ≤ x ≤ 0.15) Thin Films on Substrates with Different Thermal-Expansion Coefficients.

Author

Suslov, A.V., Grabov, V. M., Komarov, V. A., Demidov, E. V., Senkevich, S. V., and Suslov, M. V.

Subjects
THIN films, BISMUTH, ANTIMONY, CONDUCTION bands, VALENCE bands, THERMAL expansion, SINGLE crystals
Abstract

The results of calculation of the charge-carrier concentration in bismuth–antimony films on substrates with different coefficients of thermal expansion are reported. The antimony content in the films is in the range 0–15 at %. Calculation is performed on the basis of experimental studies of the galvanomagnetic properties of the films. It is shown that the concentration is considerably higher in the case of substrates with a large coefficient of thermal expansion. The results of calculation of the position of the valence and conduction bands at 77 K in relation to the coefficient of thermal expansion of the substrate are reported. It is shown that, as the thin films experience in-plane strains defined by a difference between the coefficients of thermal expansion of the film and substrate materials, the position of the valence and conduction bands in the films changes relative to the position of the bands in the single crystal with the corresponding composition. [ABSTRACT FROM AUTHOR]

Published
2019
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47. Исследование естественно униполярного и полярного состояния в тонких пленках ЦТС при изменением содержания свинца

Author

Осипов, В. В., Каптелов, Е. Ю., Сенкевич, С. В., Киселев, Д. А., Пронин, И. П., Osipov, V. V., Kaptelov, E. Yu., Senkevich, S. V., Kiselev, D. A., Pronin, I. P., Осипов, В. В., Каптелов, Е. Ю., Сенкевич, С. В., Киселев, Д. А., Пронин, И. П., Osipov, V. V., Kaptelov, E. Yu., Senkevich, S. V., Kiselev, D. A., and Pronin, I. P.

Abstract

Целью данной работы является исследование методом атомно-силовой микроскопии естественно униполярных и поляризованных в сильном электрическом поле тонких пленок Pb(Zr,Ti)O3 при варьировании сверх стехиометрического содержания свинца в твердых растворах., The aim of the work is to study the self-poled and polarized thin Pb(Zr,Ti)O3 films under variation of over stoichiometric content lead using piezoelectric force microscopy.

Published
2017

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