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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The Study on the Improvement of Piezoelectric and Electrical Characteristics of Bi0.5(Na0.78K0.22)0.5TiO3 Ceramics Modified by the La-based ABO3 Pervskite Structure

La 기반의 ABO3 구조를 갖는 첨가물에 따른 Bi0.5(Na0.78K0.22)0.5TiO3의 압전 및 전기적인 특성 향상 연구

  • Lee, Ku Tak (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Jung Soo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Yun, Ji Sun (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Jeong Ho (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Young Hun (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Paik, Jong Hoo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology)
  • 이규탁 (한국세라믹기술원 전자소재융합본부) ;
  • 박정수 (한국세라믹기술원 전자소재융합본부) ;
  • 윤지선 (한국세라믹기술원 전자소재융합본부) ;
  • 조정호 (한국세라믹기술원 전자소재융합본부) ;
  • 정영훈 (한국세라믹기술원 전자소재융합본부) ;
  • 백종후 (한국세라믹기술원 전자소재융합본부)
  • Received : 2014.09.01
  • Accepted : 2014.10.24
  • Published : 2014.11.01
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Abstract

The $0.99Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3-0.01LaAlO_3$, $0.01LaMnO_3$ or $0.01LaFeO_3$ (0.99BNKT-0.01LA, 0.01LM or 0.01LF) ceramics were prepared by a conventional mixed mothod. The structure and morphology of the lead free ceramics were characterized by XRD (X-ray diffraction) and FE-SEM (field emission scanning electron microscopy). XRD results indicated that the BNKT ceramics modified by LA, LM or LF induced a transition from a ferroelectric tetragonal to a non-polar pseudo-cubic phase, leading to decrease in the remnant polarization ($P_r$) and coercive field ($E_c$) in the P-E hysterisis loops. The effects of the BNKT ceramics modified by La-based $ABO_3$ pervskite structure on the electric-field induced strain were investigated, and the largest normalized unipolar strain ($S_{max}/E_{max}$) was found in BNKT-0.01LF ceramic.

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References

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