Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Low-Temperature Sintering and Piezoelectric Properties of $(Na_{0.5}K_{0.5})NbO_3$ Lead-Free Piezoelectric Ceramics

  • Seo, In-Tae (Department of Materials Science and Engineering, Korea University) ;
  • Park, Hwi-Yeol (Department of Materials Science and Engineering, Korea University) ;
  • Choi, Jae-Hong (Department of Materials Science and Engineering, Korea University) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
  • Published : 2010.03.25
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Abstract

$(Na_{0.5}K_{0.5})NbO_3$ (NKN) ceramic with 1.5 mol% CuO added (NKNC) was well sintered even at a low temperature of $900^{\circ}C$ with the addition of ZnO. Most of the ZnO reacted with the CuO and formed the liquid phase that assisted the densification of the specimens at $900^{\circ}C$. A few $Zn^{2+}$ ions entered the matrix of the specimens and increased the coercive field ($E_c$) and $Q_m$ values of the specimens. High-piezoelectric properties of $k_p=0.37$, $Q_m=755$, and ${\varepsilon}_3\;^T/{\varepsilon}_0=327$ were obtained from the NKNC ceramics containing 1.0 mol% ZnO sintered at $900^{\circ}C$ for 2 h.

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