Bondarev V. S.1,2, Mikhaleva E. A.1, Bogdanov E. V.1,3, Gorev M. V.1,2, Molokeev M. S.1,2, Flerov I. N.1,2
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
2Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, Russia
3Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
Email: vbondarev@yandex.ru, gorev@iph.krasn.ru
The heat capacity, thermal expansion and hydrostatic pressure susceptibility of NH4HSeO4 ceramic samples have been investigated. The main parameters of the low temperature transitions between the para/pyroelectric (T_1) ↔ incommensurate (T_2)↔ ferroelectric (T_3)↔ para/pyroelectric phases were determined. The phase T-p diagram was refined and the baric coefficient dT3/dp was determined. The volumetric strain behaviour and the results of direct measurements of T_3(p) allowed us to establish the nature of the pressure effect on the stability of the ferroelectric phase. The extensive and intensive barocaloric effects were determined taking into account lattice thermal expansion. Keywords: phase transitions, ferroelectrics, heat capacity, thermal expansion, pressure, barocaloric effect.
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