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Electrocaloric and barocaloric effects in some ferroelectric hydrosulfates and triglycinesulfate / E. A. Mikhaleva [et al.] // Ferroelectrics. - 2012. - Vol. 430. - P. 78-83, DOI 10.1080/00150193.2012.677717. - 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). . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
AMMONIUM
RbHSO4
Кл.слова (ненормированные):
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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Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Davydova, T. N.; Давыдова, Тамара Николаевна; European Meeting on Ferroelectricity(12 ; 2011 ; 26 June - 1 July ; Bordeaux, France)
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    Cooling method based on electrocaloric effect realized in periodically switching electric filed in triglycinesulphate [Текст] / V. S. Bondarev [и др.] // 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
   Перевод заглавия: Метод охлаждения на основе электрокалорического эффекта в периодическом электрическом поле в триглицинсульфате

Материалы конференции,
Материалы конференции,
Материалы конференции

Доп.точки доступа:
Flerov, I. N. \mem. of progr. comm.\; Флёров, Игорь Николаевич; Zinenko, V. I. \mem. of progr. comm.\; Зиненко, Виктор Иванович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(12 ; 2014 ; Sept. 29 - Oct. 2 ; Riga); International Conference Functional Materials and Nanotechnologies(9 ; 2014 ; Sept. 29 - Oct. 2 ; Riga)
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Magnetization and magnetocaloric effect in La0.7Pb0.3MnO3 ceramics and 0.85(La0.7Pb0.3MnO3)–0.15(PbTiO3) composite / E. Mikhaleva [et al.] // J. Mater. Res. - 2015. - Vol. 30, Is. 2. - P. 278-285, DOI 10.1557/jmr.2014.369. - Cited References:29. - This work was supported by Council on Grants from the President of theRussian Federation for Support of Leading Scientific Schools (Grant No.NSh-924.2014.2). . - ISSN 0884. - ISSN 2044-5326. -

РУБ Materials Science, Multidisciplinary
Рубрики:
PHASE-TRANSITIONS
ELECTROCALORIC MATERIALS
Аннотация: The magnetization behavior under temperature and magnetic field variation was investigated for La0.7Pb0.3MnO3 ceramics and ferromagnetic-ferroelectric 0.85(La0.7Pb0.3MnO3)-0.15(PbTiO3) composite. The second-order ferromagnetic phase transition in manganite is shifted to the tricritical point in composite material. Comparison of the intensive caloric effect and the difference between relative cooling powers (RCP) in both materials proves a significant role of intrinsic pressure in elevating caloric efficiency in composite induced by elastic coupling between the grains of LPM and PT components. No temperature change in composite under an electric field of 2 kV/cm associated with electrocaloric effect or indirect magnetoelectric coupling was observed. The effect of magnetic field on some peculiar temperatures is considered. A contribution from pressure generated by magnetic field to baric coefficient dT/dp of ferromagnetic transformation temperature in composite was suggested. The results obtained were analyzed in the framework of the magnetic equation of state and compared with the experimentally measured heat capacity.

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Держатели документа:
SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660079, Russia.

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Eremin, E. V.; Еремин, Евгений Владимирович; Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Sablina, K. A.; Саблина, Клара Александровна; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Council on Grants from the President of the Russian Federation forSupport of Leading Scientific Schools [NSh-924.2014.2]
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Caloric and multicaloric effects in oxygen ferroics and multiferroics / I. N. Flerov [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 3. - P. 429-441, DOI 10.1134/S1063783415030075. - 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). . - ISSN 1063. - ISSN 1090-6460. -

РУБ Physics, Condensed Matter
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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Публикация на русском языке Калорические и мультикалорические эффекты в кислородных ферроиках и мультиферроиках [Текст] / И. Н. Флёров [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 3. - С. 421-431

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Всероссийская конференция по физике сегнетоэлектриков(20 ; 2014 ; 18-22 авг. ; Красноярск)
}
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Flerov, I. N.
Electrocaloric effect and anomalous conductivity of the ferroelectric NH4HSO4 / I. N. Flerov, E. A. Mikhaleva // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 478-484, DOI 10.1134/S1063783408030141. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Flerov, I. N.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Mikhaleva, E. A.] Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
ИФ СО РАН

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Флёров, Игорь Николаевич
}
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    Intensive electrocaloric effect in triglycine sulfate under nonequilibrium thermal conditions and periodic electric field / V. S. Bondarev [et al.] // Phys. Status Solidi B. - 2016. - Vol. 253, Is. 10. - P. 2073-2078, DOI 10.1002/pssb.201600339. - Cited References:29. - The reported study was funded by RFBR and Government of Krasnoyarsk Territory according to the research project no. 16-42-240428 p_a. . - ISSN 0370-1972. - ISSN 1521-3951
   Перевод заглавия: Интенсивный электрокалорический эффект в триглицинсульфате в неравновесных тепловых условиях и периодическом электрическом поле

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
electrocaloric effect -- ferroelectrics -- nonequilibrium processes -- phase -- transitions
Аннотация: We present the results of both direct measurements and modeling of the intensive electrocaloric effect ΔTAD in ferroelectric triglycine sulfate under nonequilibrium thermal conditions and periodically varying electric field. In the narrow region around the phase transition temperature TC, a visible difference was observed between the electrocaloric responses at applying ΔTON and removal ΔTOFF of the constant electric field: |ΔTON| <|ΔTOFF| and |ΔTON| > |ΔTOFF| at T < TC and T > TC, respectively. The variation of the frequency and profile of the periodic electric field at T < TC allowed one to obtain the gradual decrease in the average temperature of the top of the sample compared to the bottom kept at the constant temperature. At low frequency electric field, qualitative agreement was found between the time dependences of the measured experimentally and calculated ΔT values. Experimental and modeling studies of electrocaloric effect ΔTAD in triglycine sulfate showed that the applying/removal of a periodic electric field to/from the bulk sample decreases the average value of the waiving temperature of the top Ttop compared to T ≃ const of the bottom. Both frequency and duty cycle of the electric field impulses strongly affect Ttop.

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Держатели документа:
Kirensky Inst Phys, Siberian Branch RAS, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; RFBR; Government of Krasnoyarsk Territory [16-42-240428 p_a]
}
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Electrocaloric effect in triglycine sulfate under equilibrium and nonequilibrium thermodynamic conditions / V. S. Bondarev [et al.] // Phys. Solid State. - 2017. - Vol. 59, Is. 6. - P. 1118-1126, DOI 10.1134/S1063783417060051. - 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. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
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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Публикация на русском языке Электрокалорический эффект в триглицинсульфате в равновесных и неравновесных термодинамических условиях [Текст] / В. С. Бондарев [и др.] // Физ. тверд. тела : Наука, 2017. - Т. 59 Вып. 6. - С. 1097–1105

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240428r_a]
}
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Gorev, M. V.
T-p phase diagrams and the barocaloric effect in materials with successive phase transitions / M. V. Gorev, E. V. Bogdanov, I. N. Flerov // J. Phys. D. - 2017. - Vol. 50, Is. 38. - Ст. 384002, DOI 10.1088/1361-6463/aa8025. - Cited References:51. - 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. 17-42-240076 p-a. . - ISSN 0022-3727. - ISSN 1361-6463

РУБ Physics, Applied
Рубрики:
SOLID-STATE REFRIGERATION
ELECTROCALORIC REFRIGERATION
MAGNETIC
Кл.слова (ненормированные):
barocaloric effect -- phase transition -- phase diagram -- entropy
Аннотация: An analysis of the extensive and intensive barocaloric effect (BCE) at successive structural phase transitions in some complex fluorides and oxyfluorides was performed. The high sensitivity of these compounds to a change in the chemical pressure allows one to vary the succession and parameters of the transformations (temperature, entropy, baric coefficient) over a wide range and obtain optimal values of the BCE. A comparison of different types of schematic T-p phase diagrams with the complicated dependences observed experimentally shows that in some ranges of temperature and pressure the BCE in compounds undergoing successive transformations can be increased due to a summation of caloric effects associated with distinct phase transitions. The maximum values of the extensive and intensive BCE in complex fluorides and oxyfluorides can be realized at rather low pressure (0.1-0.3 GPa). In a narrow temperature range around the triple points conversion from conventional BCE to inverse BCE is observed, which is followed by a gigantic change of both |ΔSBCE| and |ΔTAD|.

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Держатели документа:
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia.
Krasnoyarsk State Agrarian Univ, Inst Engn Syst & Energy, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Горев, Михаил Васильевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [17-42-240076 p-a]
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Intensive electrocaloric effect in the multilayer capacitor under equilibrium and nonequilibrium thermal conditions / V. S. Bondarev [et al.] // Scripta Mater. - 2018. - Vol. 146. - P. 51-54, DOI 10.1016/j.scriptamat.2017.11.017. - Cited References: 27. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research, project no. 16-42-240428 r_a. A. V. Es'kov acknowledges the support from the Government of Russian Federation under grant 074-U01. . - ISSN 1359-6462
Кл.слова (ненормированные):
Electrocaloric effect -- Phase transition -- Ferroelectrics
Аннотация: Precise direct measurements of the intensive electrocaloric effect (ECE) in commercial multilayer capacitor based on doped BaTiO3 were performed using an adiabatic calorimeter. High reversibility of ECE studied under equilibrium thermal conditions was observed. The nonequilibrium thermal conditions caused by fixing the temperature of one of the ends of the linear EC element lead to the predominance of ECE when the electric field is turned off. The heat flow through the EC element appearing under the influence of a periodic electric field and depending on its frequency makes it possible to create a cooling cycle without thermal keys.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
International Laboratory Materials and Structures for Electro- and Magnetocaloric Energy Conversion, ITMO University, St. Petersburg, Russian Federation

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Shabanov, A. V.; Шабанов, Александр Васильевич; Es'kov, A. V.
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10.

    Influence of thermal conditions on the electrocaloric effect in a multilayer capacitor based on doped BaTiO3 / V. S. Bondarev [et al.] // J. Adv. Dielectr. - 2017. - Vol. 7, Is. 6. - Ст. 1750041, DOI 10.1142/S2010135X17500412. - Cited References: 32. - 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. 16-42-240428 r_a, and partially financially supported by Government of Russian Federation, Grant 074-U01. . - ISSN 2010-135X. - ISSN 2010-1368
   Перевод заглавия: Влияние тепловых свойств на электрокалорический эффект в мультислойном конденсаторе на основе допированного BaTiO3
Кл.слова (ненормированные):
Electrocaloric effect -- ferroelectrics -- layered structures -- nonequilibrium conditions -- phase transitions
Аннотация: We present the results of studies of thermal expansion, heat capacity, permittivity, polarization and the influence of different thermal conditions on the intensive electrocaloric effect (ECE), ΔTAD, in a commercial multilayer capacitor based on doped BaTiO3. Investigations in a wide temperature range revealed one anomaly in the behavior of the physical properties at about 290K characteristic for the relaxors. Direct measurements showed a high reversibility of ECE under equilibrium thermal conditions. Good agreement was found between the values of ΔTAD determined by direct and indirect measurements at the electric field up to 15.4 kV/cm. Quasi-isothermal conditions lead, firstly, to decrease of large ΔTAD ≈0.94K obtained in adiabatic conditions under E = 308 kV/cm to 0.87 K, and, secondly, the appearance of a difference between the values of ΔTON and ΔTOFF determined when the electric field is applied and removed. Using this phenomenon and changing the frequency of the periodic electric field, E = 15.4 kV/cm, the effect of cooling was obtained equal to [(ΔTON + ΔT OFF)/2]max = -0,032 K. The results obtained are useful for further development of the electrocaloric refrigeration technique without thermal switches.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk 660074, Russia
International Laboratory “Materials and Structures for Electro- and Magnetocaloric Energy Conversion”, ITMO University, St. Petersburg 197101, Russia

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Shabanov, A. V.; Шабанов, Александр Васильевич; Es'kov, A. V.
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