Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Comparison of Abnormal Grain Growth Behavior of Lead-Free (Na,K)NbO3-M(Cu,Nb)O3, (M = Ca, Sr, Ba) Piezoelectric Ceramics

비납계 (Na,K)NbO3-M(Cu,Nb)O3, (M = Ca, Sr, Ba) 압전 세라믹의 비정상 결정 성장 거동 비교

  • Jung, Seungwoon (Department of Materials Science and Engineering, Inha University) ;
  • Lim, Ji-Ho (Department of Materials Science and Engineering, Inha University) ;
  • Jung, Han-Bo (Department of Materials Science and Engineering, Inha University) ;
  • Ji, Sung-Yub (Department of Materials Science and Engineering, Inha University) ;
  • Choi, Seunggon (Department of Materials Science and Engineering, Inha University) ;
  • Jeong, Dae-Yong (Department of Materials Science and Engineering, Inha University)
  • 정승운 (인하대학교 신소재공학과) ;
  • 임지호 (인하대학교 신소재공학과) ;
  • 정한보 (인하대학교 신소재공학과) ;
  • 지성엽 (인하대학교 신소재공학과) ;
  • 최승곤 (인하대학교 신소재공학과) ;
  • 정대용 (인하대학교 신소재공학과)
  • Received : 2020.04.23
  • Accepted : 2020.06.22
  • Published : 2020.07.27
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Abstract

NKN [(Na,K)NbO3] is a candidate lead-free piezoelectric material to replace PZT [Pb(Zr,Ti)O3]. A single crystal has excellent piezoelectric-properties and its properties are dependent of the crystal orientation direction. However, it is hard to fabricate a single crystal with stoichiometrically stable composition due to volatilization of sodium during the growth process. To solve this problem, a solid solution composition is designed (Na,K)NbO3-Ba(Cu,Nb)O3 and solid state grain growth is studied for a sizable single crystal. Ceramic powders of (Na,K)NbO3-M(Cu,Nb)O3 (M = Ca, Sr, Ba) are synthesized and grain growth behavior is investigated for different temperatures and times. Average normal grain sizes of individual specimens, which are heat-treated at 1,125 ℃ for 10 h, are 6.9, 2.8, and 1.6 ㎛ for M = Ca, Sr, and Ba, respectively. Depending on M, the distortion of NKN structure can be altered. XRD results show that (NKN-CaCuN: shrunken orthorhombic; NKN-SrCuN: orthorhombic; NKN-BaCuN: cubic). For the sample heat-treated at 1,125 ℃ for 10 h, the maximum grain sizes of individual specimens are measured as 40, 5, and 4,000 ㎛ for M = Ca, Sr, and Ba, respectively. This abnormal grain size is related to the partial melting temperature (NKN-CaCuN: 960 ℃; NKN-SrCuN: 971 ℃; NKN-BaCuN: 945 ℃).

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References

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