화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.29, No.4, 205-210, April, 2019
DOI10.3740/MRSK.2019.29.4.205  Export Citation
과 액상 형성에 의한 비납계 압전 (Na,K)NbO3.Ba(Cu,Nb)O3 결정립의 비정상 성장 거동 및 전기적 특성
Fast Abnormal Grain Growth Behavior and Electric Properties of Lead-Free Piezoelectric (K,Na)NbO3.Ba(Cu,Nb)O3 Grains through Transient Liquid Phase
임지호, 이주승, 이승희, 정한보, 박춘길, 안철우1, 유일열2, 조경훈2, 정대용†
  • 인하대학교 신소재공학과
  • 1한국기계연구원 부설 재료연구소
  • 2금오공과대학교 신소재공학과
Ji-Ho Lim, Ju-Seung Lee, SeungHee Lee, Han-Bo Jung, Chun-kil Park, Cheol-Woo Ahn1, Il-Ryeol Yoo2, Kyung-Hoon Cho2, and Dae-Yong Jeong†
  • Department of Materials Science and Engineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea
  • 1Functional Ceramics Department, Powder & Ceramics Division, Korea Institute of Materials Science (KIMS), 797 Changwon-daero, Changwon, Gyeongnam 51508, Republic of Korea
  • 2School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea
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Pb(Zr,Ti)O3 (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)NbO3 (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)NbO3-Ba(Cu,Nb)O3 (NKN-BCuN) is chosen to fabricate the single crystal with relative ease. NKNBCuN 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 δ 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 μC/cm2.
Keywords:NKN;transient liquid phase;abnormal grain growth;single crystal
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