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2019 Vol.29, Issue 4
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

Ji-Ho Lim1
,
Ju-Seung Lee1
,
SeungHee Lee1
,
Han-Bo Jung1
,
Chun-kil Park1
,
Cheol-Woo Ahn2
,
Il-Ryeol Yoo3
,
Kyung-Hoon Cho3
,
Dae-Yong Jeong1†
임 지호1
,
이 주승1
,
이 승희1
,
정 한보1
,
박 춘길1
,
안 철우2
,
유 일열3
,
조 경훈3
,
정 대용1†
1Department of Materials Science and Engineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea
2Functional Ceramics Department, Powder & Ceramics Division, Korea Institute of Materials Science (KIMS), 797 Changwon-daero, Changwon, Gyeongnam 51508, Republic of Korea
3School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea
1인하대학교 신소재공학과
2한국기계연구원 부설 재료연구소
3금오공과대학교 신소재공학과
†Corresponding author E-Mail : dyjeong@inha.ac.kr (D.-Y. Jeong, Inha Uviv.)
April 2019. pp. 205-210
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Abstract

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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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :4
  • Pages :205-210
  • Received Date : 2019-02-20
  • Revised Date : 2019-03-08
  • Accepted Date : 2019-03-08
  • DOI :https://doi.org/10.3740/MRSK.2019.29.4.205
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