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http://dx.doi.org/10.4313/JKEM.2021.34.6.7

Structural and Electrical Properties of K(Ta,Nb)O3 Ceramics with Variation of Ag Contents for Electrocaloric Devices  

Lee, Min-Sung (Department of Ceramics Engineering, School of Materials Science and Engineering, Gyeongsang National University)
Park, Byeong-Jun (Research Institute for Green Energy Convergence Technology, Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
Lim, Jeong-Eun (Research Institute for Green Energy Convergence Technology, Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
Lee, Sam-Haeng (Research Institute for Green Energy Convergence Technology, Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
Lee, Myung-Gyu (Research Institute for Green Energy Convergence Technology, Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
Park, Joo-Seok (Business Support Division, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Gap (Department of Ceramics Engineering, School of Materials Science and Engineering, Gyeongsang National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.34, no.6, 2021 , pp. 442-448 More about this Journal
Abstract
In this work, the (K1-xAgx)(Ta0.8Nb0.2)O3 (x=0.1-0.4) ceramics were fabricated using mixed-oxide method, and their structural and electrical properties were measured. All specimens represented a pseudo cubic structure with the lattice constant of 0.3989 nm. When 0.4 mol of Ag was added, second phases induced from metallic Ag and K2(Ta,Nb)6O16 phase were observed. Dielectric constant and dielectric loss of K(Ta0.8Nb0.2)O3 specimen doped with 0.3 mol of Ag were 2,737 and 0.446, respectively. The curie temperature was about -5℃, which does not change with Ag addition. The remanent polarization began to decrease sharply around 12~15℃, and the temperature at which the remanent polarization began to decrease as the applied voltage increased shifted to the high temperature side. The electrocaloric effect (ΔT) and electrocaloric efficiency (ΔT/ΔE) of the (K0.7Ag0.3)(Ta0.8Nb0.2)O3 ceramics were 0.01024℃ and 0.01825 KmV-1, respectively.
Keywords
$K(Ta,Nb)O_3$; Electrocaloric effect; Hysteresis loop; Ferroelectricity; Dielectric properties;
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