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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Low Temperature Sintering of Lead-Free Bi1/2Na1/2TiO3-SrTiO3 Piezoceramics by Li2CO3-B2O3 Addition

Li2CO3와 B2O3를 첨가한 Bi1/2Na1/2TiO3-SrTiO3 무연 압전 세라믹스의 저온 소성 연구

  • Lee, Sang Sub (Department of Materials Science and Engineering, University of Ulsan) ;
  • Park, Young-Seok (Department of Materials Science and Engineering, University of Ulsan) ;
  • Duong, Trang An (Department of Materials Science and Engineering, University of Ulsan) ;
  • Devita, Mukhlishah Aisyah (Department of Materials Science and Engineering, University of Ulsan) ;
  • Han, Hyoung-Su (Department of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (Department of Materials Science and Engineering, University of Ulsan)
  • Received : 2021.08.07
  • Accepted : 2021.09.30
  • Published : 2022.01.01
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Abstract

This study investigated microstructures, crystal structures, polarization, dielectric and electromechanical properties of 0.76Bi1/2Na1/2TiO3-0.24SrTiO3 (BNT-24ST)-based piezoceramcs by adding Li2CO3 and B2O3 (LB) as sintering aids for low-temperature sintering. All samples were successfully synthesized using conventional solid-state reaction method and sintered at 950, 1,000, 1,050, 1,100 and 1,175℃ for 2 hours. Without LB, specimens required sintering temperatures over 1,175℃ for sufficient densification, while the addition of 0.10-mol LB decreased the sintering temperatures down to 950℃. The average grain size and dielectric properties of BNT-24ST-10LB ceramics were enhanced with increasing sintering temperature. We found that the low-temperature sintered BNT-24ST piezoceramics by adding LB showed the d33*value of 402 pm/V at 4 kV/mm after sintering at 1,050℃, which was better than that of high-temperature fired specimens sintered at 1,175℃ without LB (242 pm/V). We believe that the results of this study promise a candidate for low-cost multilayer ceramic actuator applications.

Keywords

Acknowledgement

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

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