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http://dx.doi.org/10.4313/JKEM.2020.33.6.465

Electrocaloric Effect in Heterolayered K(Ta,Nb)O3/Pb(Zr,Ti)O3 Thin Films Fabricated by Spin-Coating Method  

Yang, Young-Min (Department of Railroad Engineering, Woosong University)
Yuk, Ji-Soo (Bioden Co.)
Kim, Ji-Won (Department of Materials Engineering and Covergence Technology, Engineering Research Institute, Gyeongsang National University)
Yi, Sam-Haeng (Department of Materials Engineering and Covergence Technology, Engineering Research Institute, Gyeongsang National University)
Park, Joo-Seok (Business Cooperation Center, Business Support Division, Korea Ceramic Engineering and Technology (KICET))
Kim, Young-Gon (Department of Electronics, Chosun College of Science and Technology)
Lee, Sung-Gap (Department of Materials Engineering and Covergence Technology, Engineering Research Institute, Gyeongsang National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.33, no.6, 2020 , pp. 465-470 More about this Journal
Abstract
Heterolayered K(Ta,Nb)O3/Pb(Zr,Ti)O3 thin films on Pt/Ti/SiO2/Si substrates were prepared by a sol-gel process and spin-coating method. The structural and electrical properties were measured to investigate the possibility of application as an electrocaloric effect device. All specimens exhibited dense and uniform cross-sectional structures without pores, and the average thickness of the specimen coated six times was approximately 394 nm. Curie temperatures were observed at 5℃ or less in type-I and 10℃ in type-II specimens, respectively. Type-II specimens coated 6 times showed a relative dielectric constant of 758 and remanent polarization of 9.71 μC/㎠ at room temperature. The maximum electrocaloric effect occurred between 20 and 25℃, slightly higher than their Curie temperature, and the electrocaloric property (ΔT) of the type-II specimens coated 6 times was approximately 1.2℃ at room temperature.
Keywords
Heterolayered; Electrocaloric effect; Sol-gel; Screen printing; Hysteresis;
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