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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Tailoring Low-field Strain Properties of [0.97Bi1/2(Na0.78K0.22)1/2TiO3-0.03LaFeO3]-Bi1/2(Na0.82K0.18)1/2TiO3 Lead-Free Relaxor/Ferroelectric Composites

무연 완화형/정규 강유전체 복합소재 [0.97Bi1/2(Na0.78K0.22)1/2TiO3-0.03LaFeO3]-Bi1/2(Na0.82K0.18)1/2TiO3의 저전계 전계유기 변형 특성 연구

  • Hong, Chang-Hyo (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology) ;
  • Kang, Jin-Kyu (School of Materials Science and Engineering, University of Ulsan) ;
  • Jo, Wook (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • 홍창효 (울산과학기술원 신소재공학부) ;
  • 강진규 (울산대학교 첨단소재공학부) ;
  • 조욱 (울산과학기술원 신소재공학부) ;
  • 이재신 (울산대학교 첨단소재공학부)
  • Received : 2016.04.13
  • Accepted : 2016.05.24
  • Published : 2016.06.01
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Abstract

We investigated the effect of $Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3$ (BNKT) modification on the ferroelectric and electric-field-induced strain (EFIS) properties of lead-free $0.97Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3-0.03LaFeO_3$ (BNKTLF) ceramics as a function of BNKT content (x= 0, 0.1, 0.2, 0.3, 0.5, and 1). BNKT-modified BNKTLF powders were synthesized using a conventional solid-state reaction method. As the BNKT content x increased from 0 to 1 the normalized electric-field-induced strain ($S_{max}/E_{max}$) was observed to increase at relatively low fields, i.e., below the poling field. Moreover, BNKTLF-30BNKT showed about 460 pm/V as low as at 3 kV/mm, which is a considerably high value among the lead-free systems reported so far. Consequently, it was confirmed that ceramic-ceramic composite, a mixture of an ergodic relaxor matrix and embedded ferroelectric seeds, is a salient way to make lead-free piezoelectrics practical with enhanced EFIS at low field as well as less hysterical.

Keywords

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