Electrocaloric Effect in Pb0.3CaxSr0.7-xTiO3 Ceramics Near Room Temperature

doi:10.15541/jim20180551

Abstract

Abstract:

The electrocaloric (EC) effect is strongly related to interaction of polarization and temperature changes, showing great potential in high-efficient solid state refrigeration. This work focuses on the Pb_0.3Ca_xSr_0.7-_xTiO₃ (PCST(x), x = 0.00, 0.05, 0.10, 0.15) ceramics in which the influence of Ca content on dielectric and ferroelectric property under electric field was studied, and the EC temperature change was calculated through indirect method. Substitution of Ca largely modifies the diffused phase transition behaviors of PCST ceramics, which the diffusion exponent of PCST(0.05) increases with electric field up, indicating a promising wide temperature range of large electrocaloric effect. Thus, the largest adiabatic temperature change (1.71 K) is obtained near the room temperature in PCST(0.05) by indirect method. With an electric field of 8 kV/mm, PCST(0.05) ceramic shows good EC effect in a wide temperature range that the adiabatic temperature change is larger than 1 K from 5 ℃ to 70 ℃.

Key words: electrocaloric effect, ferroelectrics ceramics, diffused phase transition

CLC Number:

TQ174

HAN Liu-Yang, GUO Shao-Bo, YAN Shi-Guang, RÉMIENS Denis, WANG Gen-Shui, DONG Xian-Lin. Electrocaloric Effect in Pb_0.3Ca_xSr_0.7-_xTiO₃ Ceramics Near Room Temperature[J]. Journal of Inorganic Materials, 2019, 34(9): 1011-1014.

Figures/Tables 5

References 19

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Material	Form	T_C/℃	ΔT/K	ΔE/(kV?mm^-1)	(ΔT/ΔE)/(×10^-6, K?m?V^-1)	Method	Ref.
PCST(0.00)	Ceramic	14.9	1.52	8.0	0.19	Indirect	This work
PCST(0.05)	Ceramic	19.5	1.71	8.0	0.21	Indirect	This work
PCST(0.10)	Ceramic	18.0	1.43	8.0	0.18	Indirect	This work
PCST(0.15)	Ceramic	8.0	1.49	8.0	0.19	Indirect	This work
PbZr_0.95Ti_0.05O₃	Film	226.0	12.00	77.6	0.15	Indirect	[4]
PbMg_1/3Nb_2/3O₃	Ceramic	67.0	2.50	9.0	0.27	Direct	[16]
0.75PMN-0.25PT	Single crystal	110.0	0.66	2.5	0.26	Direct	[17]
PMN-30PT	Ceramic	145.0	2.60	9.0	0.29	Direct	[16]
Ba_0.94Dy_0.04TiO₃	Ceramic	138.0	1.04	3.0	0.35	Direct	[18]
BaZr_0.2Ti_0.8O₃	Ceramic	39.0	4.50	14.5	0.31	Direct	[19]
BaTiO₃	Single crystal	129.0	0.90	1.2	0.75	Direct	[7]

Material	Form	T_C/℃	ΔT/K	ΔE/(kV?mm^-1)	(ΔT/ΔE)/(×10^-6, K?m?V^-1)	Method	Ref.
PCST(0.00)	Ceramic	14.9	1.52	8.0	0.19	Indirect	This work
PCST(0.05)	Ceramic	19.5	1.71	8.0	0.21	Indirect	This work
PCST(0.10)	Ceramic	18.0	1.43	8.0	0.18	Indirect	This work
PCST(0.15)	Ceramic	8.0	1.49	8.0	0.19	Indirect	This work
PbZr_0.95Ti_0.05O₃	Film	226.0	12.00	77.6	0.15	Indirect	[4]
PbMg_1/3Nb_2/3O₃	Ceramic	67.0	2.50	9.0	0.27	Direct	[16]
0.75PMN-0.25PT	Single crystal	110.0	0.66	2.5	0.26	Direct	[17]
PMN-30PT	Ceramic	145.0	2.60	9.0	0.29	Direct	[16]
Ba_0.94Dy_0.04TiO₃	Ceramic	138.0	1.04	3.0	0.35	Direct	[18]
BaZr_0.2Ti_0.8O₃	Ceramic	39.0	4.50	14.5	0.31	Direct	[19]
BaTiO₃	Single crystal	129.0	0.90	1.2	0.75	Direct	[7]

Electrocaloric Effect in Pb_0.3Ca_xSr_0.7-_xTiO₃ Ceramics Near Room Temperature

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