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Research Article | Open Access

Theoretical investigations on electrocaloric properties of (111)-oriented PbMg_1/3Nb_2/3O₃ single crystal

Mahmoud Aly HAMAD^{^*}()

Physics Department, Faculty of Science, Tanta University, Tanta, Egypt

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Abstract

The electrocaloric (EC) effect accompanied with the ferroelectric to paraelectric phase transition in (111)-oriented PbMg_1/3Nb_2/3O₃ (PMN) is investigated. It is shown that the largest change $Δ T$ is 0.37 K in 3 kV/cm electric field shift near the Curie temperature of 221 K; that is, the cooling $Δ T$ per unit field (MV/m) is 1.23×10^-6 m·K/V. This value is significantly larger, and comparable with the value of 0.254×10^-6 m·K/V for PbZr_0.95Ti_0.05O₃ thin film under larger electric field shift $Δ E$ = 30 kV/cm. Thus, the EC effect of (111) PMN single crystal provides cooling solutions at low temperatures, and opens more opportunities for practical application in cooling systems.

Keywords

electrocaloric (EC) effect PbMg_1/3Nb_2/3O₃ (PMN)model polarization entropy change heat capacity change

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Journal of Advanced Ceramics

Volume 2 Issue 4,
December 2013

Pages 308-312

DOI: 10.1007/s40145-013-0076-7

Cite this article:

HAMAD MA. Theoretical investigations on electrocaloric properties of (111)-oriented PbMg_1/3Nb_2/3O₃ single crystal. Journal of Advanced Ceramics, 2013, 2(4): 308-312. https://doi.org/10.1007/s40145-013-0076-7

10.1007/s40145-013-0076-7.F001 Fig. 1Dependence of polarization as a function of temperature described by Eq. (1) .
10.1007/s40145-013-0076-7.F002 Fig. 2Polarization variation induced by temperature change under different electric fields for (111) PMN single crystal. The dashed lines are modeled results by Eq. (1) and symbols represent experimental data from Ref. [ 27 ].
10.1007/s40145-013-0076-7.F003 Fig. 3Absolute values of electrocaloric entropy changes versus temperature due to applied electric field shifts for (111) PMN single crystal. They are obtained by Eq. (2) at different electric field shifts.
10.1007/s40145-013-0076-7.F004 Fig. 4Heat capacity changes for (111) PMN single crystal due to applied electric field shifts $Δ E$ versus temperature. They are obtained by Eq. (7) at different electric field shifts.
10.1007/s40145-013-0076-7.F005 Fig. 5Electrocaloric temperature changes $Δ T$ due to applied electric field shifts $Δ E$ versus temperature for (111) PMN single crystal. They are obtained by Eq. (8) at different electric field shifts.

Return

10.1007/s40145-013-0076-7.T001Table 1Model parameters for (111) PMN single crystal due to applied electric field

E (kV/cm)	T_C (K)	P_i (C/m²)	P_f (C/m²)	B (C/(m²·K))	${\frac{d P}{d T} \|}_{T = T_{C}}$ (C/(m²·K))
1.5	230	0.128	0.009	-0.000 10	-0.001
2.0	199	0.276	0.088	-0.000 60	-0.015
2.5	209	0.277	0.083	-0.000 55	-0.015
3.0	221	0.280	0.085	-0.000 60	-0.015

10.1007/s40145-013-0076-7.T002Table 2Calculated values of electrocaloric properties of (111) PMN single crystal at different electric field shifts

$Δ E$ (kV/cm)	$δ T_{FWHM}$ (K)	$\| Δ S^{E} \|_{\max}$ (J/(kg·K))	$\| Δ T \|_{\max}$ (K)	RCP (J/kg)	RC (J/kg)	$Δ C_{\min}$ (J/(kg·K))	$Δ C_{\max}$ (J/(kg·K))
1.5	127.25	0.02	0.01	2.29	1.83	-0.04	0.05
2.0	11.90	0.36	0.22	4.29	3.44	-7.65	8.29
2.5	12.20	0.45	0.29	5.50	4.41	-10.19	10.23
3.0	12.34	0.54	0.37	6.68	5.35	-12.31	13.32

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