Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Structural and Electrical Properties of K(Ta,Nb)O3 Ceramics with Variation of Ag Contents for Electrocaloric Devices

전기열량소자용 Ag 첨가량에 따른 K(Ta,Nb)O3 세라믹스의 구조적·전기적 특성

  • 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)
  • 이민성 (경상국립대학교 나노신소재공학부 세라믹공학전공) ;
  • 박병준 (경상국립대학교 나노신소재융합공학과 그린에너지융합연구소) ;
  • 임정은 (경상국립대학교 나노신소재융합공학과 그린에너지융합연구소) ;
  • 이삼행 (경상국립대학교 나노신소재융합공학과 그린에너지융합연구소) ;
  • 이명규 (경상국립대학교 나노신소재융합공학과 그린에너지융합연구소) ;
  • 박주석 (한국세라믹기술원 기업지원본부) ;
  • 이성갑 (경상국립대학교 나노신소재공학부 세라믹공학전공)
  • Received : 2021.07.21
  • Accepted : 2021.07.28
  • Published : 2021.11.01
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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

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03038697) and This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1I1A3052426).

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