The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Structural and Electrical Properties of (Na0.5K0.5)NbO3 Ceramics with Addition of BiTiO3

BiTiO3 첨가에 따른 (Na0.5K0.5)NbO3 세라믹스의 구조적, 전기적 특성

  • 이태호 (경상대 공대 세라믹 공학과) ;
  • 김대영 (경상대 공대 세라믹 공학과) ;
  • 조서현 (경상대 공대 세라믹 공학과) ;
  • 정광호 (경상대 공대 세라믹 공학과) ;
  • 이성갑 (경상대 공학원 세라믹 공학과)
  • Received : 2011.09.26
  • Accepted : 2011.10.25
  • Published : 2011.11.01
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Abstract

In this study, lead-free $(Na_{0.5}K_{0.5})NbO_3-BiTiO_3$ ceramics were fabricated by a conventional mixed oxide method. Structural and electrical properties of lead-free $(Na_{0.5}K_{0.5})NbO_3$ ceramics with the variation of $BiTiO_3$ were investigated. The results of X-ray diffraction analysis showed a typical polycrystalline perovskite structure without presence of the second phase in all specimens. Sintered density increased with an increasing of BTO and the specimen added with 0.07 mol% of $BiTiO_3$ showed the maximum value of 97.8%. Average grain size decreased and densification increased with an increasing of $BiTiO_3$ contents. The electromechanical coupling factor of the 0.01 mol% $BiTiO_3$ doped NKN specimens was 0.32. Dielectric constant, dielectric loss and Curie temperature of the 0.07 mol% $BiTiO_3$ doped NKN specimens were 1185, 0.145% and $400^{\circ}C$, respectively.

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References

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