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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Molokeev M. S., Kartashev A. V., Flerov I. N.
Заглавие : Anisotropy of piezocaloric effect at ferroelectric phase transitions in ammonium hydrogen sulphate
Место публикации : J. Alloys Compd. - 2020. - Vol. 839. - Ст.155085. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2020.155085
Примечания : Cited References: 31. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023 ). X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: The role of anisotropy of the thermal expansion in formation of piezocaloric effect (PCE) near ferroelectric phase transitions in NH4HSO4 was studied. Strong difference in linear baric coefficients and as a result in intensive and extensive PCE associated with the different crystallographic axes was found. PCE giving the main contribution to the barocaloric effect were determined at both phase transitions. Rather strong effect of the lattice dilatation on the tuning of PCE was observed. Comparative analysis of PCE at the phase transitions in different materials showed that NH4HSO4 can be considered as a promising solid-state refrigerant. A hypothetical cooling cycle based on alternate using uniaxial pressure along two axes was considered.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Molokeev M. S., Kartashev A. V., Flerov I. N.
Заглавие : Anisotropy of piezocaloric effect at ferroelectric phase transitions in ammonium hydrogen sulphate
Коллективы : Fall Meeting, European Materials Research Society, European Materials Research Society, Warsaw University of Technology
Место публикации : E-MRS fall meeting: conference programme. - 2019. - Ст.E.P.4
Примечания : This work was supported by the Russian Science Foundation (RSF) grant (No. 19-72-00023)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Mikhaleva E. A., Gorev M. V., Kartashev A. V.
Заглавие : Caloric and multicaloric effects in oxygen ferroics and multiferroics
Коллективы : Всероссийская конференция по физике сегнетоэлектриков
Место публикации : Phys. Solid State/ Всероссийская конференция по физике сегнетоэлектриков (20 ; 2014 ; 18-22 авг. ; Красноярск): MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 3. - P.429-441. - ISSN 1063, DOI 10.1134/S1063783415030075. - ISSN 10906460(eISSN)
Примечания : Cited References:53. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-924.2014.2).
Предметные рубрики: PHASE-TRANSITIONS
MAGNETOCALORIC MATERIALS
ELECTROCALORIC MATERIALS
REFRIGERATION
CERAMICS
OXYFLUORIDES
Аннотация: The main problems of the current state-of-the-art research into the caloric effects observed in oxygen ferroics, multiferroics, and composites, as well as the influence of different factors (anisotropy, dimensional parameters, direct and indirect interferroic interactions) on these effects, have been considered. Possible ways to increase the caloric efficiency of materials have been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Flerov I. N.
Заглавие : Caloric effects and phase transitions in ferroelectric-ferromagnetic composites (x) La0.7Pb0.3MnO3 – (1-x) PbTiO3
Коллективы : Functional Materials and Nanotechnologies
Место публикации : International Conference “Functional materials and nanotechnologies” FM&NT 2012. - 2012. - P.82
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Volkov N. V., Shabanov A. V.
Заглавие : Caloric effects and phase transitions in ferromagnetic-ferroelectric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3
Коллективы : Russian Foundation for Basic Research [12-02-31253-mol-a]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [N 8379]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]
Место публикации : J. Mater. Res. - 2013. - Vol. 28, Is. 24. - P.3322-3331. - ISSN 0884-2914, DOI 10.1557/jmr.2013.360. - ISSN 2044-5326
Примечания : Cited References: 24. - This study was supported in parts by The Russian Foundation for Basic Research (Grant No. 12-02-31253-mol-a), Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (N 8379), and Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (Grant NO. NSh-4828.2012.2). Dr. Maxim S. Molokeev is acknowledged for the x-ray characterization of the samples.
Предметные рубрики: PRESSURE
TEMPERATURE
Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N., Mikhaleva E. A., Kartashev A. V., Gorev M. V.
Заглавие : Caloric Effects in Multiferroic Composites (x)La0.7Pb0.3MnO3 — (1-x)PbTiO3
Коллективы : Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, Young scientists school on the spectroscopic, Физико-технический институт им. А.Ф. Иоффе РАН, Санкт-Петербургский политехнический университет им. Петра Великого
Место публикации : Joint 14th Rus./CIS/Baltic/Japan Symp. on Ferroelectricity (RCBJSF)/ Young sci. school on the spect. studies of critical dynamics at struct. phase trans.: Abstract book/ org. comm. A. N. Vtyurin ; progr. comm. I. N. Flerov. - 2018. - P.11. - ISBN 978-5-9651-1144-2
Примечания : Cited References:
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Mikhaleva E. A., Kartashev A. V., Bondarev V. S.
Заглавие : Caloric Effects in Some Ferroelectric and Ferroelastic Fluorides, Oxyfluorides and Oxides
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, International Workshop on Relaxor Ferroelectrics
Место публикации : Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016): book of abstracts. - 2016. - Ст.Invite-6
Примечания : References: 4. - The reported study was partially supported by RFBR, research project No. 15-02-02009 a
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Bondarev V. S., Bogdanov E. V., Flerov I. N.
Заглавие : Comparative analysis of elastocaloric and barocaloric effects in single-crystal and ceramic ferroelectric (NH4)2SO4
Место публикации : Scripta Mater. - 2021. - Vol. 191. - P.149-154. - ISSN 13596462 (ISSN), DOI 10.1016/j.scriptamat.2020.09.030
Примечания : Cited References: 47. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023 ). X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: We report the influence of anisotropy and texture on elasto(ElCE)- and baro(BCE)-caloric effects in single-crystal and ceramic (NH4)2SO4. Inverse extensive and intensive ElCE in ceramics, (ΔSElCE)cer = 87 J/kg·K; ΔTAD = - 11.6 K), as well as in a single crystal along the ferroelectric axis a, (ΔSElCE)a = 115 J/kg·K; (ΔTAD)a = - 16 K, significantly exceed BCE, ΔSBCE = 75 J/kg·K; ΔTAD = - 9.8 K, even at low pressure ~ 0.3 GPa. Caloric parameters of ammonium sulphate are comparable with those for promising solid-state refrigerants.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Mikhaleva E. A., Flerov I. N., Bogdanov E. V.
Заглавие : Conventional and inverse barocaloric effects in ferroelectric NH4HSO4
Место публикации : J. Alloys Compd. - 2019. - Vol. 806. - P.1047-1051. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2019.07.273
Примечания : Cited References: 22
Аннотация: In this study, the conventional and inverse barocaloric effects (BCE) in ferroelectric NH4HSO4 are reported. Maximum extensive and intensive BCE near order–disorder phase transition can be achieved at low pressure p≤0.1 GPa. Large thermal expansion of the crystal lattice plays a very important role in the developing conventional BCE and conversation between BCE of different sign in the narrow temperature range.
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bondarev V. S., Gorev M. V., Mikhaleva E. A., Flerov I. N.
Заглавие : Cooling method based on electrocaloric effect realized in periodically switching electric filed in triglycinesulphate
Коллективы : Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, International Conference Functional Materials and Nanotechnologies
Место публикации : Joint 12th Russia/CIS/Baltic/Japan Symp. Ferroelectricity. 9th Int. Conf. Funct. Mater. Nanotechnologies : book of abstracts/ mem. of progr. comm.: I. N. Flerov, V. I. Zinenko. - 2014. - P.126. - ISBN 978-9984-45-875-5
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Gorev M. V., Flerov I. N.
Заглавие : Direct and indirect studies of the electrocaloric effect in single crystalline ferrielectric (NH4)2SO4
Место публикации : J. Alloys Compd. - 2022. - Vol. 892. - Ст.162130. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2021.162130
Примечания : Cited References: 38. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023)
Аннотация: The influence of an electric field on the phase transition parameters and the electrocaloric response in ferrielectric (NH4)2SO4 was studied using a universal multifunctional adiabatic calorimeter. The very low sensitivity of the phase transition temperature to the electric field, dT0/dE ≈ 5·10-3 K/(kV/cm), was shown to be the reason for the low maximum value of the intensive electrocaloric effect, ΔTAD, at E = 11 kV/cm: direct and indirect measurements gave the values of 0.01 K and 0.05 K, respectively. However, the extensive electrocaloric response revealed by an analysis of the entropy–temperature–electric field phase diagram was relatively large, with a value of ΔSECE ≈ − 19 J/kg K, due to the significant contribution of a jump in the excess entropy to the total value, δS0/ΔS0 ~ 0.37. An additional irreversible increase in temperature under the electric field was associated with the Joule effect and indicated a significant electrical conductivity of ammonium sulphate.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of a restricted geometry on thermal and dielectric properties of NH4HSO4 ferroelectric
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity , Russian Foundation for Basic Research (RFBR) [16-32-00092 mol_a]
Место публикации : Ferroelectrics. - 2017. - Vol. 513, Is. 1. - P.44-50. - ISSN 0015-0193, DOI 10.1080/00150193.2017.1350436. - ISSN 1563-5112(eISSN)
Примечания : Cited References:17. - The reported study was partially supported by the Russian Foundation for Basic Research (RFBR), research project No. 16-32-00092 mol_a.
Предметные рубрики: PHASE-TRANSITIONS
AMMONIUM
CAPACITY
SULFATE
KH2PO4
Ключевые слова (''Своб.индексиров.''): ferroelectric--phase transition--porous glass--nanocomposite
Аннотация: Heat capacity, thermal dilatation, sensitivity to pressure and permittivity of NH4HSO4 embedded into glass matrices with a pore size of 320 nm and 46 nm were studied. Large difference in the thermal expansion of both glass and ferroelectric leads to a "clamped" state of NH4HSO4 in nanocomposites and to the phase transition temperatures change. The restricted geometry does not effect on the order of successive transformations in NH4HSO4 but is accompanied by a significant reduction in entropy of phase transitions. The behavior of DTA-signal and permittivity show the expansion of the temperature range of the ferroelectric phase under hydrostatic pressure.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Dotsenko I. I., Rysiakiewicz-Pasek E.
Заглавие : Effect of a restricted geometry on thermal and dielectric properties of NH4HSO4 ferroelectric
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, International Workshop on Relaxor Ferroelectrics
Место публикации : Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016): book of abstracts. - 2016. - Ст.P-18
Примечания : References: 2
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Bondarev V. S., Kogotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of interaction of components on thermal properties of ferroelectric nanocomposites
Коллективы : "Porous Glasses-Special Glasses", Seminar, Wroclaw University of Science and Technology
Место публикации : Eleventh Seminar Porous Glasses-Special Glasses (PGL'2018): Abstracts and program. - 2018. - Ст.18. - P.23
Примечания : Библиогр.: 2
,
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Molokeev M. S., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of restricted geometry and external pressure on the phase transitions in ammonium hydrogen sulfate confined in a nanoporous glass matrix
Место публикации : J. Mater. Sci. - 2018. - Vol. 53, Is. 15. - P.12132–12144. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-018-2467-1
Примечания : Cited References: 44. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the Research Project No. 16-32-00092 mol_a.
Ключевые слова (''Своб.индексиров.''): hydraulics--hydrostatic pressure--permittivity--pore size--specific heat--sulfur compounds--thermal expansion
Аннотация: A study of heat capacity, thermal dilatation, susceptibility to hydrostatic pressure, permittivity and polarization loops was carried out on NH4HSO4–porous glass nanocomposites (AHS + PG) as well as empty glass matrices. The formation of dendrite clusters of AHS with a size, dcryst, exceeding the pore size was found. An insignificant anisotropy of thermal expansion of AHS + PG showing statistically uniform distribution of AHS with random orientations of nanocrystallites over the matrix was observed. The effect of internal and external pressures on thermal properties and permittivity was studied. At the phase transition P-1 ↔ Pc, a strongly nonlinear decrease in the entropy ΔS2 and volume strain (ΔV/V)T2 was observed with decreasing dcryst. The linear change in temperatures of both phase transitions P-1 ↔ Pc ↔ P21/c under hydrostatic pressure is accompanied by the expansion of the temperature range of existence of the ferroelectric phase Pc, while this interval narrows as dcryst decreases.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Shabanov A. V.
Заглавие : Effect of Sequential Heat Impacts on the Formation of a Stable State of the xLPM-(1-x)PT Multiferroic Composites
Коллективы : Russian Foundation for Basic Research [17-42-240076]; Government of the Krasnoyarsk Territory [17-42-240076]; Krasnoyarsk Territorial Foundation [17-42-240076]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 12. - P.2524-2531. - ISSN 1063-7834, DOI 10.1134/S1063783419010189. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 15. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of the Scientific and R&D Activity, project no. 17-42-240076 "Complex Approach to Searching and Development of Promising Solid-State Ferroic Cooling Agents Based on the Single- and Multicaloric Effects."
Предметные рубрики: PbTiO3
Аннотация: The effect of thermal cycling and sintering temperature on the chemical and thermodynamic stability of the bulk multiferroic xLa0.7Pb0.3MnO3–(1 – x)PbTiO3 quasi-ceramic and ceramic composites has been experimentally investigated. It is shown that the limiting temperature of the long-term sample firing should not exceed 1070 K. It has been found that sintering at this temperature and/or short-term exposure of the samples at higher temperatures (up to 1220 K) significantly increase the sample compactness, stabilize the thermal expansion, and enhance the quality of the composites. It has been established that the component grain integrity is violated by shrinkage of the samples and a sharp change in their volume during the phase transition of a ferroelectric component.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Bondarev V. S., Gorev M. V., Vasiliev A. D., Davydova T. N.
Заглавие : Electrocaloric and barocaloric effects in some ferroelectric hydrosulfates and triglycinesulfate
Коллективы : European Meeting on Ferroelectricity
Место публикации : European Meeting on Ferroelectricity (12 ; 2011 ; 26 June - 1 July ; Bordeaux, France). Ferroelectrics: Taylor & Francis LTD, 2012. - Vol. 430. - P.78-83. - ISSN 0015-0193, DOI 10.1080/00150193.2012.677717
Примечания : Cited References: 14. - This work was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (project no, Nsh - 4645.2010.2).
Предметные рубрики: PHASE-TRANSITIONS
AMMONIUM
RbHSO4
Ключевые слова (''Своб.индексиров.''): ferroelectrics--phase transitions--electrocaloric and barocaloric effects
Аннотация: A comparative analysis of electrocaloric and barocaloric efficiency of order-disorder ferroelectrics Rbx(NH4)1-xHSO4 and TGS is performed. A good agreement was found between intensive electrocaloric effects measured experimentally and calculated using electric equation of state. Barocaloric effects were evaluated analyzing the experimental data on heat capacity and T-p phase diagrams. In some crystals under study the same adiabatic temperature change can be produced by low pressure and rather high electric field.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Mikhaleva E. A.
Заглавие : Electrocaloric effect and anomalous conductivity of the ferroelectric NH4HSO4
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 3. - P478-484. - ISSN 1063-7834, DOI 10.1134/S1063783408030141
Примечания : Cited References: 10
Предметные рубрики: PHASE-TRANSITIONS
Аннотация: An intensive electrocaloric effect in the uniaxial ferroelectric NH4HSO4 near the second-order phase transition (T-1 approximate to 271 K) is studied. A high electrical conductivity of the NH4HSO4 crystal is revealed, and its temperature dependence is investigated. The results obtained are analyzed together with the data available for the ferroelectrics, which hold promise for the use as solid-state cooling agents.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Flerov I. N., Gorev M. V.
Заглавие : Electrocaloric effect in triglycine sulfate under equilibrium and nonequilibrium thermodynamic conditions
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240428r_a]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 6. - P.1118-1126. - ISSN 1063-7834, DOI 10.1134/S1063783417060051. - ISSN 1090-6460(eISSN)
Примечания : Cited References:25. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research, project no. 16-42-240428r_a.
Предметные рубрики: PERIODIC ELECTRIC-FIELD
Аннотация: The direct and indirect measurements of intensive electrocaloric effect in a triglycine sulfate ferroelectric crystal are performed under equilibrium and nonequilibrium thermodynamic conditions implemented in the adiabatic calorimeter. The effect of the electric field parameters (frequency, profile, and strength) on the value of the effect and degree of its reversibility are studied. The difference between the temperature variation values in a switched-on and switched-off dc field under quasi-isothermal conditions is established. The low-frequency periodic electric field induces the temperature gradient along the electrocaloric element and heat flux from its free end to the thermostated base. A significant excess of the field switching-off rate over the switching-on rate leads to a noticeable intensification of the cooling effect.
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