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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Ferroelectric to Relaxor Transition Behavior in Lead-Free Ternary (Bi0.5Na0.5)TiO3-BiFeO3-SrTiO3 Piezoceramics

Bi0.5Na0.5TiO3-BiFeO3-SrTiO3 삼성분계 무연 압전 세라믹스의 강유전체-완화형 강유전체 상전이 거동

  • Lee, Sang Sub (School of Material Science and Engineering, University of Ulsan) ;
  • Lee, Chang-Heon (School of Material Science and Engineering, University of Ulsan) ;
  • Duong, Trang An (School of Material Science and Engineering, University of Ulsan) ;
  • Nguyen, Hoang Thien Khoi (School of Material Science and Engineering, University of Ulsan) ;
  • Han, Hyoung-Su (School of Material Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Material Science and Engineering, University of Ulsan)
  • Received : 2020.11.19
  • Accepted : 2020.12.09
  • Published : 2021.01.01
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Abstract

This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3-0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x＝0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.

Keywords

Acknowledgement

이 성과는 정부(교육부, 과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 것임(과제번호: 2016R1D1A3B01008169, 과제번호: 2020R1C1C1007375).

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