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Piezoelectric and Dielectric Properties of Non-stochiometric(K0.5Na0.5)0.97(Nb0.96-xTaxSb0.04)O3 Ceramics

비화학양론적인 (K0.5Na0.5)0.97(Nb0.96-xTaxSb0.04)O3 세라믹스의 유전 및 압전특성

  • Sin, Sang-Hoon (Department of Electrical Engineering, Semyung University) ;
  • Noh, Jung-Rae (Department of Electrical Engineering, Semyung University) ;
  • Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University)
  • Received : 2012.07.05
  • Accepted : 2012.07.24
  • Published : 2012.08.01

Abstract

In this study non-stoichiometric $(K_{0.5}Na_{0.5})_{0.97}(Nb_{0.96-x}Ta_xSb_{0.04})O_3$ ceramics were prepared by the conventional soild-state teaction method. The effect of Ta-substitution on the dielectric and piezoelectric properties were investigated. X-ray diffraction analysis of all the specimens less than x= 15 mol% indicated orthorhombic phase. Thereafter, the specimens showed orthorhombic phase near to pseudo-cubic. Sinterablity of all the specimens was improved due to secondary products such as KCT and KCN. The ceramics with x= 5 mol% showed the optimum velues of pizoelectric constant($d_{33}$)= 150 pC/N, electromechanical coupling factor (kp)= 0.45, electromechanical quality factor (Qm)= 418.9 and dielectric constant(${\varepsilon}_r$)= 567. Accordingly, These results indicate that the composition ceramics is a promising candidate for lead-free material.

Keywords

References

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