Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Dielectric and piezoelectric properties of 0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 lead-free ceramics

0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 무연 세라믹스의 유전 및 압전 특성

  • 김미로 (한국과학기술연구원 전자재료센터) ;
  • 윤석진 (한국과학기술연구원 전자재료센터) ;
  • 최지원 (한국과학기술연구원 전자재료센터)
  • Received : 2010.01.08
  • Accepted : 2010.03.24
  • Published : 2010.03.31
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Abstract

0.96$(Na_{0.5}K_{0.5})NbO_3$-0.04$(Ba_{(1-x)}Sr_x)TiO_3$ lead free piezoelectric ceramics were synthesized to enhance the piezoelectric properties of (Na,K)$NbO_3$. The systhesis and sintering method were the conventional solid state reaction method and general sintering method in air atmosphere. The polymorphic phase transition(PPT) was observed at all composition(0 $\leq$ x $\leq$ 0.05) when $(Ba_{(1-x)}Sr_x)TiO_3$ were added in the $(Na_{0.5}K_{0.5})NbO_3$. As Sr concentration was increased, grain size, dielectric loss(tan$\delta$) and mechanical quality factor($Q_m$) were decreased and piezoelectric constant($d_{33}$) and electromechanical coupling factor($k_p$) were increased within a limited value. The optimized piezoelectric and properties, $d_{33}$, $k_p$, $Q_m$, and tand, of 0.96$(Na_{0.5}K_{0.5})NbO_3$-0.04$(Ba_{(1-x)}Sr_x)TiO_3$ were 139 pC/N, 0.31 %, 95, 0.04 at the composition of x=0.04.

Keywords

References

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