Pb0.3CaxSr0.7-xTiO3陶瓷的室温电卡效应

doi:10.15541/jim20180551

摘要/Abstract

摘要：

电卡效应是极性材料中极化强度和温度的相互作用, 具有电卡效应的铁电陶瓷材料在高效固态制冷领域有很好的应用前景。本研究以Pb_0.3Ca_xSr_0.7-_xTiO₃[PCST(x), x = 0.00, 0.05, 0.10, 0.15]陶瓷为对象, 系统研究了在电场作用下Ca含量对材料介电性能和铁电性能的影响, 并通过间接法计算了不同温度下材料的电卡温变。研究结果显示: Ca含量可显著调控PCST陶瓷的弥散相变特性, PCST(0.05)的相变弥散因子随外加电场的增大而增大, 可利用弥散相变在较宽温度区间内获得较大的电卡效应。经计算可得: PCST(0.05)在室温下可产生1.71 K的温变。当电场为8 kV/mm时, PCST(0.05)陶瓷在5~70 ℃的温度范围内, 绝热温变均大于1 K, 表现出优异的电卡效应。

关键词: 电卡效应, 铁电陶瓷, 弥散相变

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

中图分类号:

TQ174

韩刘洋, 郭少波, 闫世光, RÉMIENSDenis, 王根水, 董显林. Pb_0.3Ca_xSr_0.7-_xTiO₃陶瓷的室温电卡效应[J]. 无机材料学报, 2019, 34(9): 1011-1014.

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.

图/表 5

参考文献 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]

Pb_0.3Ca_xSr_0.7-_xTiO₃陶瓷的室温电卡效应

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

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