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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Effects of Sodium Excess on Ferroelectric Properties of Bi0.5(Na0.78K0.22)0.5TiO3 Ceramics

Bi0.5(Na0.78K0.22)0.5TiO3 세라믹스의 강유전 특성에 미치는 나트륨 과잉 효과

  • Park, Jung-Soo (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Seong-Won (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Young-Hun (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Yun, Ji-Sun (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Paik, Jong-Hoo (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sung-Gap (Department of Materials Science and Engineering, Gyeong-Sang National University) ;
  • Cho, Jeong-Ho (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
  • 박정수 (한국세라믹기술원 전자소재부품센터) ;
  • 김성원 (한국세라믹기술원 전자소재부품센터) ;
  • 정영훈 (한국세라믹기술원 전자소재부품센터) ;
  • 윤지선 (한국세라믹기술원 전자소재부품센터) ;
  • 백종후 (한국세라믹기술원 전자소재부품센터) ;
  • 이성갑 (경상대학교 재료공학과) ;
  • 조정호 (한국세라믹기술원 전자소재부품센터)
  • Received : 2016.08.13
  • Accepted : 2016.11.07
  • Published : 2016.12.01
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Abstract

To investigate excess $Na^+$ effect, $Bi_{0.5}(Na_{0.78+x}K_{0.22})_{0.5}TiO_3$ ($0{\leq}x{\leq}0.05$) (BNKT) ceramics were prepared by using a conventional solid-state reaction method. The structure and ferroelectric properties of BNKT ceramics were characterized by XRD (X-ray diffraction) and polarization dependence by external electric field. Also, the temperature dependence of dielectric constant and loss were studied. From these results, it was found that appropriate excess $Na^+$ into BNKT ceramics compensate the volatility and induce dense ceramics. The enhanced piezoelectric coefficient (158 pC/N) and depolarization temperature ($202^{\circ}C$) were obtained for the x=0.01 composition.

Keywords

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