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

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of Ta Doping on Piezoelectric Properties of Lead-Free (K0.5Na0.5)NbO3 Ceramics

(K0.5Na0.5)NbO3 세라믹스의 압전 특성에 대한 Ta 도핑 효과

  • Kang, Jin-Kyu (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Yong-Hui (School of Materials Science and Engineering, University of Ulsan) ;
  • Heo, Dae-Jun (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Hyun-Young (School of Materials Science and Engineering, University of Ulsan) ;
  • Dinh, Thi Hinh (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • 강진규 (울산대학교 첨단소재공학부) ;
  • 이용희 (울산대학교 첨단소재공학부) ;
  • 허대준 (울산대학교 첨단소재공학부) ;
  • 이현영 (울산대학교 첨단소재공학부) ;
  • 딘치힌 (울산대학교 첨단소재공학부) ;
  • 이재신 (울산대학교 첨단소재공학부)
  • Received : 2014.03.28
  • Accepted : 2014.04.14
  • Published : 2014.05.01
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Abstract

We investigated the effect of Ta doping on the dielectric and piezoelectric properties of lead-free $(K_{0.5}Na_{0.5})NbO_3$ ceramics prepared using a conventional ceramic processing. X-ray diffraction analysis revealed that Ta was perfectly substituted into Nb-sites in the range of 0 to 20 at%. As Ta content in the KNN increased, the sinterability of KNN ceramics was significantly degraded while the Ta doping enhanced the piezoelectric constant $d_{33}$, planar mode piezoelectric coupling coefficient ($k_p$), and electromechanical quality factor ($Q_m$). The highest values for $d_{33}$, $k_p$, and $Q_m$ was found to be 156 pC/N, 0.37, and 155, respectively.

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References

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