Direct and indirect studies of the electrocaloric effect in single crystalline ferrielectric (NH4)2SO4

被引：8

作者：

Bondarev, V. S. ^{[1
,2
]}

Mikhaleva, E. A. ^{[1
]}

Gorev, M. V. ^{[1
,2
]}

Flerov, I. N. ^{[1
,2
]}

机构：

[1] RAS, SB, Kirensky Inst Phys, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia

[2] Siberian Fed Univ, Inst Engn Phys & Radioelectron, Krasnoyarsk 660074, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 892卷

基金：

俄罗斯科学基金会;

关键词：

Ferrielectric; Electrocaloric effect; Phase transition; Entropy; TEMPERATURE; EQUILIBRIUM; TRANSITION;

D O I：

10.1016/j.jallcom.2021.162130

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of an electric field on the phase transition parameters and the electrocaloric response in ferrielectric (NH4)(2)SO4 was studied using a universal multifunctional adiabatic calorimeter. The very low sensitivity of the phase transition temperature to the electric field, dT(0)/dE approximate to 5.10(-3) K/(kV/cm), was shown to be the reason for the low maximum value of the intensive electrocaloric effect, Delta T-AD, 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 Delta S-ECE approximate to - 19 J/kg K, due to the significant contribution of a jump in the excess entropy to the total value, delta S-0/Delta S-0 similar to 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. (C)Y 2021 Elsevier B.V. All rights reserved.

引用

页数：6

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