Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1142/S2010135X17500412

Ключевые слова: 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), Delta T-AD, 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 Delta T-AD 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 Delta T-AD approximate to 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 Delta T-ON and Delta T-OFF 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 (Delta T-ON + Delta T-OFF)/2](max) = -0.032 K. The results obtained are useful for further development of the electrocaloric refrigeration technique without thermal switches.

Журнал: JOURNAL OF ADVANCED DIELECTRICS

Выпуск журнала: Vol. 7, Is. 6

Номера страниц: 1750041

ISSN журнала: 2010135X

Место издания: SINGAPORE

Издатель: WORLD SCIENTIFIC PUBL CO PTE LTD

• Bondarev V.S. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660074, Russia)
• Flerov I.N. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660074, Russia)
• Gorev M.V. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660074, Russia)
• Pogoreltsev E.I. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660074, Russia)
• Molokeev M.S. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660074, Russia)
• Mikhaleva E.A. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
• Shabanov A.V. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
• Es'kov A.V. (ITMO Univ, Int Lab Mat & Struct Electro & Magnetocalor Energ, St Petersburg 197101, Russia)

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