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

Seungwoon Jung; Ji-Ho Lim; Han-Bo Jung; Sung-Yub Ji; Seunggon Choi; Dae-Yong Jeong

doi:10.3740/MRSK.2020.30.7.343

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2020 Vol.30, Issue 7 Preview Page Next Page

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

July 2020. pp. 343-349

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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 °C for 10 h, are 6.9, 2.8, and 1.6 mm 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 °C for 10 h, the maximum grain sizes of individual specimens are measured as 40, 5, and 4,000 mm for M = Ca, Sr, and Ba, respectively. This abnormal grain size is related to the partial melting temperature (NKN-CaCuN: 960 °C; NKN-SrCuN: 971 °C; NKN-BaCuN: 945 °C).

Keywords

NKN

transient liquid phase

abnormal grain growth

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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 : 30
No :7
Pages :343-349
Received Date : 2020-04-23
Revised Date : 2020-06-22
Accepted Date : 2020-06-22
DOI :https://doi.org/10.3740/MRSK.2020.30.7.343

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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