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Piezoelectric Characteristics of Lead-Free 0.74(Bi0.5Na0.5)TiO3-0.26SrTiO3 Ceramics According to Calcination Temperature

무연 0.74(Bi0.5Na0.5)TiO3-0.26SrTiO3 압전 세라믹스의 하소온도 변화에 따른 전기적 특성 변화

  • Kim, Seong-Hyun (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Sang-Hun (School of Materials Science and Engineering, University of Ulsan) ;
  • Han, Hyoung-Su (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • 김성현 (울산대학교 첨단소재공학부) ;
  • 이상훈 (울산대학교 첨단소재공학부) ;
  • 한형수 (울산대학교 첨단소재공학부) ;
  • 이재신 (울산대학교 첨단소재공학부)
  • Received : 2018.09.05
  • Accepted : 2018.10.19
  • Published : 2019.01.01

Abstract

In this study, we investigated the optimum calcination temperature of lead-free $0.74(Bi_{0.5}Na_{0.5})TiO_3-0.26SrTiO_3$(BNST) piezoelectric ceramics by analyzing the crystal structure, dielectric properties, and electric field-induced strain behavior. BNST ceramics prepared by conventional solid-state reaction methods at various calcination temperatures according to the industrial standard. All samples of BNST ceramics were subsequently sintered at $1,175^{\circ}C$ for 2 h. Crystal structure classification of the ceramics showed a single perovskite phase, with no second phase detectable for the samples calcined at $750^{\circ}C$ or higher. BNST samples calcined at $850^{\circ}C$ exhibited the most optimal values for itsand the common physical parameters of $density=5.518g/cm^3$, ${\varepsilon}=1,871.837$, $tan{\delta}=0.047$, and ${d_{33}}^*=874pm/V$.

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Fig. 1. Linear shrinkage with calcination temperature.

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Fig. 2. Density with calcination temperature.

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Fig. 3. X-ray diffraction patterns with calcination temperature.

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Fig. 4. Dielectric constant and tanδ with calcination temperature.

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Fig. 5. The bipolar S-E loops with calcination temperature.

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Fig. 6. Smax/Emax in the bipolar with calcination temperature.

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Fig. 7. The unipolar S-E loops with calcination temperature.

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Fig. 8. Smax/Emax in the unipolar with calcination temperature.

Table 1. Characteristics of specimens.

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Acknowledgement

Supported by : 한국연구재단

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