Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Structure and Electrical Properties of 0.85NaNbO3-0.15LiNbO3 Ceramics

0.85NaNbO3-0.15LiNbO3 세라믹스의 구조 및 전기적 특성

  • Jeon, Chang Jun (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Young Hun (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Yun, Ji Sun (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Nam, Joong Hee (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Paik, Jong Hoo (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Jeong Ho (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
  • 전창준 (한국세라믹기술원 지능형전자부품팀) ;
  • 정영훈 (한국세라믹기술원 지능형전자부품팀) ;
  • 윤지선 (한국세라믹기술원 지능형전자부품팀) ;
  • 남중희 (한국세라믹기술원 지능형전자부품팀) ;
  • 백종후 (한국세라믹기술원 지능형전자부품팀) ;
  • 조정호 (한국세라믹기술원 지능형전자부품팀)
  • Received : 2013.12.18
  • Accepted : 2014.01.16
  • Published : 2014.03.31
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Abstract

Structure and electrical properties of $0.85NaNbO_3-0.15LiNbO_3$ ($(Li_{0.15}Na_{0.85})NbO_3$) ceramics were investigated as a function of sintering temperature. $(Li_{0.15}Na_{0.85})NbO_3$ ceramics were prepared by conventional solid state processing. A main phase of the orthorhombic perovskite structure and secondary phase of $LiNbO_3$ were confirmed for all sintered specimens. Dense $(Li_{0.15}Na_{0.85})NbO_3$ ceramics were obtained at sintering temperature above $1050^{\circ}C$. With increasing sintering temperature, the electromechanical coupling factor ($k_p$), piezoelectric constant ($d_{33}$) and relative dielectric constant (${\varepsilon}_r$) of the sintered specimens increased, while the mechanical quality factor ($Q_m$) decreased. These results are due to the increase of grain size and crystallite size of orthorhombic perovskite structure. Based on the temperature dependence of ${\varepsilon}_r$, stable piezoelectric properties were expected because no phase transition found up to $300^{\circ}C$. Typically, kp of 18%, $d_{33}$ of 34.7 pC/N, ${\varepsilon}_r$ of 135, and $Q_m$ of 62.8 were obtained for the specimens sintered at $1200^{\circ}C$ for 5 h.

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References

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