TY - JOUR
T1 - Electrical field dependence of electrocaloric effect in relaxor ferroelectrics
AU - Lu, S. G.
AU - Cai, Z. H.
AU - Ouyang, Y. X.
AU - Deng, Y. M.
AU - Zhang, S. J.
AU - Zhang, Q. M.
N1 - Funding Information:
This work was supported by the Natural Science Foundation of China under Grant no. 51372042 . The authors thank the invaluable help from B. Rozic, Z. Kutnjak, R. Xia and X. Z. Chen.
Publisher Copyright:
© 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Relaxor ferroelectrics demonstrate great potential in achieving large electrocaloric effect (ECE) which could be used as cooling devices in microelectronics industry as well as in daily life. The electrical field dependence of ECE, however, remains unclear, especially for relaxor ferroelectrics. The electrical field dependence of ECE can help to predict the ECE characteristics of cooling devices, and facilitate the design of highly efficient refrigerators. In this work, relaxor ferroelectric 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-PT) (011) single crystals, (PbLa)(ZrTi)O3 ceramic thin films, and poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE))/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) terpolymer/copolymer blends were used to investigate the electrical field dependence of ECE. Direct method was used to measure the ECE adiabatic temperature change as a function of electrical field. Results indicate that, the ECE temperature change tends to show quadratic relationship, i.e., ΔT-E2, at lower electrical fields. At higher fields, however, the temperature change has a tendency towards saturation in terms of the relationship, i.e., ΔT-E2/3. In the intermediate electrical fields, the temperature change shows a roughly linear relationship with electrical field. The above phenomena could be illustrated in the frame of approximately continuous phase transition derived Belov-Goryaga equation, which can be modified for ferroelectrics.
AB - Relaxor ferroelectrics demonstrate great potential in achieving large electrocaloric effect (ECE) which could be used as cooling devices in microelectronics industry as well as in daily life. The electrical field dependence of ECE, however, remains unclear, especially for relaxor ferroelectrics. The electrical field dependence of ECE can help to predict the ECE characteristics of cooling devices, and facilitate the design of highly efficient refrigerators. In this work, relaxor ferroelectric 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-PT) (011) single crystals, (PbLa)(ZrTi)O3 ceramic thin films, and poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE))/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) terpolymer/copolymer blends were used to investigate the electrical field dependence of ECE. Direct method was used to measure the ECE adiabatic temperature change as a function of electrical field. Results indicate that, the ECE temperature change tends to show quadratic relationship, i.e., ΔT-E2, at lower electrical fields. At higher fields, however, the temperature change has a tendency towards saturation in terms of the relationship, i.e., ΔT-E2/3. In the intermediate electrical fields, the temperature change shows a roughly linear relationship with electrical field. The above phenomena could be illustrated in the frame of approximately continuous phase transition derived Belov-Goryaga equation, which can be modified for ferroelectrics.
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U2 - 10.1016/j.ceramint.2015.03.206
DO - 10.1016/j.ceramint.2015.03.206
M3 - Article
AN - SCOPUS:84937521657
SN - 0272-8842
VL - 41
SP - S15-S18
JO - Ceramics International
JF - Ceramics International
IS - S1
ER -