Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Effects of Sintering Temperature on the Electric Properties of Mn-modified BiFeO3-BaTiO3 Bulk Ceramics

  • KIM, D.J. (School of Advanced Materials Engineering, Changwon National University) ;
  • LEE, M.H. (School of Advanced Materials Engineering, Changwon National University) ;
  • PARK, J.S. (School of Advanced Materials Engineering, Changwon National University) ;
  • KIM, M-H. (School of Advanced Materials Engineering, Changwon National University) ;
  • SONG, T.K. (School of Advanced Materials Engineering, Changwon National University) ;
  • KIM, W-J. (Department of Physics, Changwon National University) ;
  • JANG, K.W. (Department of Physics, Changwon National University) ;
  • KIM, S.S. (Department of Physics, Changwon National University) ;
  • DO, D. (Department of Advanced Materials Engineering, Keimyung University)
  • Received : 2014.04.28
  • Accepted : 2014.07.28
  • Published : 2015.04.15
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Abstract

Mn-modified $0.67Bi_{1.05}FeO_3-0.33BaTiO_3$ ceramics were prepared via a solid-state reaction process by using a quenching method after a sintering process at various temperatures. We obtained ceramics with improved electric properties within a narrow sintering temperature range. At the optimized sintering temperature of $990^{\circ}C$, improved ferroelectric and piezoelectric properties were observed in the 1-mol% Mn-modified ceramic. The small-field and the large-field piezoelectric constants ($d_{33}$ and $d^*_{33}$) were 135 pC/N and 250 pm/V, respectively, and the leakage current density was about $2.4{\times}10^{-7}A/cm^2$. The remnant polarization ($P_r$) and the coercive field ($E_c$) were $29{\mu}C/cm^2$ and 28 kV/cm, respectively.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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