Bondarev V. S.1,2, Mikhaleva E. A.1, Gorev M. V.1,2, Kartashev A. V.1,3, Molokeev M. S.1,2, Bogdanov E. V.1,4, Zaitsev A. I.1, Flerov I. N. 1
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
3Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
4Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
Email: vbondarev@iph.krasn.ru, katerina@iph.krasn.ru, gorev@iph.krasn.ru, akartashev@yandex.ru, msmolokeev@mail.ru, evbogdanov@iph.krasn.ru, az@iph.krasn.ru, flerov@iph.krasn.ru
An experimental study of the heat capacity, thermal expansion, and the effect of hydrostatic pressure on the permittivity of ceramics (NH_4)3H(SO_4)2 was carried out in the region of low-temperature phase transitions A2/a↔(P2/n)_1↔(P2/n)_2↔ P-1. The main thermodynamic characteristics were determined: entropy, deformation and baric coefficients associated with successive distortions of the crystal lattice. The position of the boundaries between phases (P2/n)1, (P2/n)2 and P-1 in the temperature - pressure diagram was clarified. Based on the analysis of the S(T,p) functions, the values and character of the temperature and baric behavior of the parameters of extensive and intensive barocaloric effects are determined. The absence of temperature hysteresis and a wide range of anomalous heat capacity during the A2/a↔ P2/n transition ensure high reproducibility of thermo- and barocycling processes and significant relative cooling capacity of (NH_4)3H(SO_4)2. Keywords: phase transitions, heat capacity, thermal expansion, pressure, barocaloric effect.
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