Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of La2O3 on the Piezoelectric Properties of Lead-Free (Bi0.5Na0.5)0.94Ba0.06TiO3 Piezoelectric Ceramics

무연 BNBT 세라믹스의 압전특성에 미치는 La2O3의 영향

  • Son Young-Jin (Department of Materials Science and Engineering/Research Center for Sustainable Eco-Devices and Materials (ReSEM), Chungju National University) ;
  • Yoon Man-Soon (Department of Materials Science and Engineering/Research Center for Sustainable Eco-Devices and Materials (ReSEM), Chungju National University) ;
  • Ur Soon-Chul (Department of Materials Science and Engineering/Research Center for Sustainable Eco-Devices and Materials (ReSEM), Chungju National University)
  • 손영진 (충주대학교 신소재공학과/친환경 에너지 변환 저장 소재 및 부품개발 연구센터) ;
  • 윤만순 (충주대학교 신소재공학과/친환경 에너지 변환 저장 소재 및 부품개발 연구센터) ;
  • 어순철 (충주대학교 신소재공학과/친환경 에너지 변환 저장 소재 및 부품개발 연구센터)
  • Published : 2005.12.01
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Abstract

A lead free piezoelectric material, bismuth sodium barium titanate $(Bi_{0.5}Na_{0.5})_{0.94}Ba_{0.06}TiO_3$ (BNBT), was considered as an environment-friendly alternatives for the current PZT system. A perovskite BNBT was synthesized by conventional bulk ceramic processing technique. In order to improve piezoelectric properties, $La_2O_3$ as a dopant was incorporated into the BNBT system up to 0.025 moi, ana the effects on subsequent the piezoelectric ana dielectric properties were systematically investigated. With increasing $La_2O_3$ contents, the equilibrium grain shape was remarkably evidenced and sintered density was increased. Piezoelectric and dielectric properties were s]town to have maximum values at the $La_2O_3$ contents of 0.02 mol. $La^{3+}$ ions seemed to act as a softener in the BNBT system and to enhance dielectric and piezoelectric properties in this study.

Keywords

References

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