Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Optimum Compositions for Piezoelectric Properties of Pb-free (Bi0.5Na0.5)(1-x)BaxTiO3 Ceramics

비납계 (Bi0.5Na0.5)(1-x)BaxTiO3 압전 세라믹 재료의 최적 조성

  • Sung, Yeon-Soo (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Yeo, Hong-Goo (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Cho, Jong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Song, Tae-Kwon (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Jeong, Soon-Jong (Korea Electrotechnology Research Institute, Electric and Magnetic Devices Research Group) ;
  • Song, Jae-Sung (Korea Electrotechnology Research Institute, Electric and Magnetic Devices Research Group) ;
  • Kim, Myong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
  • 성연수 (창원대학교 나노신소재 공학부) ;
  • 여홍구 (창원대학교 나노신소재 공학부) ;
  • 조종호 (창원대학교 나노신소재 공학부) ;
  • 송태권 (창원대학교 나노신소재 공학부) ;
  • 정순종 (한국전기연구원 전자기소자그룹) ;
  • 송재성 (한국전기연구원 전자기소자그룹) ;
  • 김명호 (창원대학교 나노신소재 공학부)
  • Published : 2007.02.27
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Abstract

Optimum compositions for piezoelectric properties of $(Bi_{0.5}Na_{0.5})_{(1-x)}Ba_xTiO_3$ ceramics were investigated in the range of $x=0{\sim}0.1$ covering rhombohedral to tetragonal phase regions. No impurity phases other than a perovskite phase were found and the grain size decreased with increasing x. A two-phase coexisting morphotropic phase area rather than boundary dividing rhombohedral and tetragonal phase regions appeared to exist at $x=0.05{\sim}0.08$. As for piezoelectric properties within morphotropic phase compositions, the piezoelectric constant ($d_{33}$) and the electromechanical coupling factor ($K_p$) showed peak values at x=0.065, 192 pC/N and 34%, respectively, indicating x=0.065 as an optimum composition for piezoelectric $(Bi_{0.5}Na_{0.5})_{(1-x)}Ba_xTiO_3$ ceramics.

Keywords

References

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