TY - JOUR
T1 - Giant electrocaloric effect of free-standing Pb0.85La0.1(Zr0.65Ti0.35)O3 thick films fabricated by the self-lift-off screen printing method
AU - Shen, Meng
AU - Jiang, Shenglin
AU - Li, Mingyu
AU - Liu, Yang
AU - Liu, Huan
AU - Liu, Pin
AU - Fan, Baoyan
AU - Qiu, Shiyong
AU - Zhang, Guangzu
AU - Wang, Qing
N1 - Funding Information:
We acknowledge the support from the National Science Foundation of China ( 51772108 , 61675076 , U1532146 , 61705070 and 61378076 ), the National Key Research and Development Program of China ( 2016YFB0402705 ), the China Postdoctoral Science Foundation ( 2017M612449 ), the Shenzhen Science and Technology Project ( JCYJ20170307155115402 ) and the Graduates' Innovation Fund ( 5003182005 ). We also would like to acknowledge the support from the Analytical and Testing Center, Huazhong University of Science and Technology. Appendix A
Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
PY - 2018/1
Y1 - 2018/1
N2 - Free-standing Pb0.85La0.1(Zr0.65Ti0.35)O3 (PLZT) ceramic thick films have been prepared via a facile and low-cost self-separating screen printing method for electrocaloric cooling, and the relation among the fabrication processes, phase composition, microstructure, dielectric characteristics, ferroelectric properties and electrocaloric effect (ECE) has been systematically investigated. Compared to the conventional ceramic thick films supported by substrates, the free-standing feature enables the EC cooling of the free-standing PLZT thick films to be fully used for cooling down different thermal loads rather than be futilely absorbed by the substrates. Furthermore, without the mechanical restriction of the substrates, the free-standing PLZT thick films can freely shrink during the high-temperature densification process, leading to their high density and favorable microstructures. Additionally, by introducing an adequate amount of excess PbO, the pyrochlore phase can be removed from the samples to yield high-purity perovskite PLZTs. With the comprehensive improvement in phase composition, microstructure and the elimination of mechanical strain between the active materials and substrates, the free-standing PLZT thick films exhibited an optimized ECE including changes of temperature and entropy of 1.95 °C and 2.09 J kg−1 K−1, which are almost 3 times that of the samples deposited on the Al2O3 substrates without excess PbO. This work would contribute to the development of ferroelectric ceramics, especially thick films, for practical EC cooling.
AB - Free-standing Pb0.85La0.1(Zr0.65Ti0.35)O3 (PLZT) ceramic thick films have been prepared via a facile and low-cost self-separating screen printing method for electrocaloric cooling, and the relation among the fabrication processes, phase composition, microstructure, dielectric characteristics, ferroelectric properties and electrocaloric effect (ECE) has been systematically investigated. Compared to the conventional ceramic thick films supported by substrates, the free-standing feature enables the EC cooling of the free-standing PLZT thick films to be fully used for cooling down different thermal loads rather than be futilely absorbed by the substrates. Furthermore, without the mechanical restriction of the substrates, the free-standing PLZT thick films can freely shrink during the high-temperature densification process, leading to their high density and favorable microstructures. Additionally, by introducing an adequate amount of excess PbO, the pyrochlore phase can be removed from the samples to yield high-purity perovskite PLZTs. With the comprehensive improvement in phase composition, microstructure and the elimination of mechanical strain between the active materials and substrates, the free-standing PLZT thick films exhibited an optimized ECE including changes of temperature and entropy of 1.95 °C and 2.09 J kg−1 K−1, which are almost 3 times that of the samples deposited on the Al2O3 substrates without excess PbO. This work would contribute to the development of ferroelectric ceramics, especially thick films, for practical EC cooling.
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U2 - 10.1016/j.ceramint.2017.09.158
DO - 10.1016/j.ceramint.2017.09.158
M3 - Article
AN - SCOPUS:85030768372
SN - 0272-8842
VL - 44
SP - 193
EP - 200
JO - Ceramics International
JF - Ceramics International
IS - 1
ER -