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Dielectric and Piezoelectric Properties of (Na0.54K0.46)0.96Li0.04(Nb1-0.10-xTa0.10Sbx)O3 Ceramics

(Na0.54K0.46)0.96Li0.04(Nb1-0.10-xTa0.10Sbx)O3 세라믹스의 유전 및 압전 특성

  • Byeon, Sun-Min (Department of Electrical Engineering, Semyung University) ;
  • Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University)
  • Received : 2011.06.08
  • Accepted : 2011.06.28
  • Published : 2011.08.01

Abstract

Lead-free piezoelectric ceramics with the composition of $(Na_{0.54}K_{0.46})_{0.96}Li_{0.04}(Nb_{1-0.10-x}Ta_{0.10}Sb_x)O_{3}$ (x= 0~8 mol%) were fabricated by nomal sintering at $1,090^{\circ}C$ for 5 h. the phase structure, microstructure and electrical properties were investigated with a emphasis on the influence of the Sb content. All samples exhibit a single perovskite phase over the whole compositional range. For the ceramics with x= 4 [mol%], two phase transitions are observed at $75^{\circ}C$ and $366^{\circ}C$, corresponding to the phase transitions of orthorhombic to tetragonal (To-t) and tetragonal to cubic (Tc), respectively. high electrical properties of $d_{33}$= 210.83 pC/N, kp= 40%, ${\varepsilon}_r$= 1,091.35, $\rho$= 4.54 g/$cm^2$ were obtained from the specimen with x= 4 [mol%], which suggests that the composition ceramics is a promising lead-free piezoelectric material.

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References

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