한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제25권8호
  • /
  • Pages.611-615
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  • 2012
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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비화학양론적인 (K0.5Na0.5)0.97(Nb0.96-xTaxSb0.04)O3 세라믹스의 유전 및 압전특성

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

  • 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)
  • 투고 : 2012.07.05
  • 심사 : 2012.07.24
  • 발행 : 2012.08.01
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초록

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.

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참고문헌

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