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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Dielectric and Piezoelectric Properties of Microwave Sintered BNT-ST Ceramics

마이크로파 소성법으로 제조한 BNT-ST 세라믹스의 유전 및 압전 특성

  • Lee, Sang-Hun (School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Seong-Hyun (School of Materials Science and Engineering, University of Ulsan) ;
  • Erkinov, Farrukh (School of Materials Science and Engineering, University of Ulsan) ;
  • Nguyen, Hoang Thien Khoi (School of Materials Science and Engineering, University of Ulsan) ;
  • Duong, Trang An (School of Materials Science and Engineering, University of Ulsan) ;
  • Han, Hyoung-Su (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • Received : 2019.07.12
  • Accepted : 2019.08.07
  • Published : 2020.01.01
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Abstract

This study investigated the microstructure and piezoelectric properties of lead-free 0.74(Bi1/2Na1/2)TiO3-0.26SrTiO3 (BNST26) piezoelectric ceramics sintered using a microwave furnace. For comparison, specimens were also prepared using a conventional furnace sintering (CFS). Average grain sizes of 2.4 ㎛ and 3.2 ㎛ were obtained in the sample sintered at 1,100℃ for 5 min using microwave sintering (MWS) and at 1,175℃ for 2 h using CFS, respectively. To quantify the changes in the microstructures and electrical properties according to the sintering conditions, the polarization hysteresis, bipolar and unipolar strain curves, and temperature dependence of permittivity were evaluated. As a result, it was determined that the Pmax (maximum polarization), Pr (remanent polarization) and Smax (maximum strain) values tend to increase with the average grain size. Based on these results, it is concluded that the MWS method can produce lead-free ceramics with superior performance in a relatively short time compared to the conventional CFS method.

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