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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Effect of Li2CO3 Doping on Phase Transition and Piezoelectric Properties of 0.96K0.5Na0.5NbO3-0.04SrTiO3 Ceramics

0.96K0.5Na0.5NbO3-0.04SrTiO3 세라믹스의 상전이와 압전 특성에 대한 Li2CO3 도핑 효과

  • Jae Young Park (School of Materials Science and Engineering, University of Ulsan) ;
  • Trang An Duong (School of Materials Science and Engineering, University of Ulsan) ;
  • Sang Sub Lee (School of Materials Science and Engineering, University of Ulsan) ;
  • Chang Won Ahn (Department of Physics, University of Ulsan) ;
  • Byeong Woo Kim (Department of Electrical Engineering, University of Ulsan) ;
  • Hyoung-Su Han (School of Materials Science and Engineering, University of Ulsan) ;
  • Jae-Shin Lee (School of Materials Science and Engineering, University of Ulsan)
  • 박재영 (울산대학교 첨단소재공학부) ;
  • 즈엉 짱 안 (울산대학교 첨단소재공학부) ;
  • 이상섭 (울산대학교 첨단소재공학부) ;
  • 안창원 (울산대학교 물리학과) ;
  • 김병우 (울산대학교 전기전자공학과) ;
  • 한형수 (울산대학교 첨단소재공학부) ;
  • 이재신 (울산대학교 첨단소재공학부)
  • Received : 2023.06.08
  • Accepted : 2023.07.31
  • Published : 2023.09.01
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Abstract

It was reported that a tetragonal phase can be stabilized with maintaining good piezoelectric properties when Na0.5K0.5NbO3 (KNN) is modified with 0.06 mol SrTiO3. However, such a high amount of SrTiO3 leads not only to poor sinterability but low Curie temperature (TC). To maintain high TC with good piezoelectric properties in KNN-based lead-free piezoelectric ceramics, this study investigates the effect of Li-doping on the dielectric and piezoelectric properties of 0.96Na0.5K0.5NbO3-0.04SrTiO3 (KNN-4ST) ceramics. As a result, the orthorhombic-tetragonal phase transition was observed at 2 mol% Li2CO3 modified KNN-4ST ceramics, whose TC, d33 and kp values are 328℃, 165pC/N and 0.33, respectively.

Keywords

Acknowledgement

본 연구는 한국수력원자력(주)과 지방자치단체(울산광역시)의 지원으로 수행된 연구임(2022).

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