Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Fast Abnormal Grain Growth Behavior and Electric Properties of Lead-Free Piezoelectric (K,Na)NbO3-Ba(Cu,Nb)O3 Grains through Transient Liquid Phase

과 액상 형성에 의한 비납계 압전 (Na,K)NbO3-Ba(Cu,Nb)O3 결정립의 비정상 성장 거동 및 전기적 특성

  • Lim, Ji-Ho (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Ju-Seung (Department of Materials Science and Engineering, Inha University) ;
  • Lee, SeungHee (Department of Materials Science and Engineering, Inha University) ;
  • Jung, Han-Bo (Department of Materials Science and Engineering, Inha University) ;
  • Park, Chun-kil (Department of Materials Science and Engineering, Inha University) ;
  • Ahn, Cheol-Woo (Functional Ceramics Department, Powder & Ceramics Division, Korea Institute of Materials Science (KIMS)) ;
  • Yoo, Il-Ryeol (School of Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Cho, Kyung-Hoon (School of Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Jeong, Dae-Yong (Department of Materials Science and Engineering, Inha University)
  • 임지호 (인하대학교 신소재공학과) ;
  • 이주승 (인하대학교 신소재공학과) ;
  • 이승희 (인하대학교 신소재공학과) ;
  • 정한보 (인하대학교 신소재공학과) ;
  • 박춘길 (인하대학교 신소재공학과) ;
  • 안철우 (한국기계연구원 부설 재료연구소) ;
  • 유일열 (금오공과대학교 신소재공학과) ;
  • 조경훈 (금오공과대학교 신소재공학과) ;
  • 정대용 (인하대학교 신소재공학과)
  • Received : 2019.02.20
  • Accepted : 2019.03.08
  • Published : 2019.04.27
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Abstract

$Pb(Zr,Ti)O_3$ (PZT) is used for the various piezoelectric devices owing to its high piezoelectric properties. However, lead (Pb), which is contained in PZT, causes various environment contaminations. $(K,Na)NbO_3$ (NKN) is the most well-known candidate for a lead-free composition to replace PZT. A single crystal has excellent piezoelectric-properties and its properties can be changed by changing the orientation direction. It is hard to fabricate a NKN single crystal due to the sodium and potassium. Thus, $(Na,K)NbO_3-Ba(Cu,Nb)O_3$ (NKN-BCuN) is chosen to fabricate the single crystal with relative ease. NKN-BCuN pellets consist of two parts, yellow single crystals and gray poly-crystals that contain copper. The area that has a large amount of copper particles may melt at low temperature but not the other areas. The liquid phase may be responsible for the abnormal grain growth in NKN-BCuN ceramics. The dielectric constant and tan ${\delta}$ are measured to be 684 and 0.036 at 1 kHz in NKN-BCuN, respectively. The coercive field and remnant polarization are 14 kV/cm and $20{\mu}C/cm^2$.

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References

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