Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of Bi(Mg1/2Sn1/2)O3 Modification on the Dielectric and Piezoelectric Properties of Bi1/2(Na0.8K0.2)1/2TiO3 Ceramics

Bi1/2(Na0.8K0.2)1/2TiO3 세라믹스의 유전 및 압전 특성에 대한 Bi(Mg1/2Sn1/2)O3 변성 효과

  • Pham, Ky Nam (School of Materials Science and Engineering, University of Ulsan) ;
  • Dinh, Thi Hinh (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Hyun-Young (School of Materials Science and Engineering, University of Ulsan) ;
  • Kong, Young-Min (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • 팜키남 (울산대학교 첨단소재공학부) ;
  • 딘치힌 (울산대학교 첨단소재공학부) ;
  • 이현영 (울산대학교 첨단소재공학부) ;
  • 공영민 (울산대학교 첨단소재공학부) ;
  • 이재신 (울산대학교 첨단소재공학부)
  • Received : 2012.04.15
  • Accepted : 2012.05.24
  • Published : 2012.05.31
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Abstract

The effect of $Bi(Mg_{1/2}Sn_{1/2})O_3$ (BMS) modification on the crystal structure, ferroelectric and piezoelectric properties of $Bi_{1/2}(Na_{0.8}K_{0.2})_{1/2}TiO_3$ (BNKT) ceramics has been investigated. The BMS-substitution induced a transition from a ferroelectric (FE) tetragonal to a nonpolar pseudocubic phase, leading to degradations in the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electric-field-induced strain was significantly enhanced by the BMS substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 633 pm/V under an applied electric field of 6 kV/mm when the BMS content reached 6 mol%. The abnormal enhancement in strain was attributed to the field-induced transition of the pseudocubic symmetry to other asymmetrical structure, which was not clarified in this work.

Keywords

References

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