Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Bismuth Excess on Piezoelectric and Dielectric Properties of BiFeO3-BaTiO3 Ceramics

Bi 과잉에 따른 BiFeO3-BaTiO3 세라믹스의 압전 및 유전특성

  • Lee, Jae Hong (School of Advanced Materials and Engineering, Changwon National University) ;
  • Lee, Myang Hwan (School of Advanced Materials and Engineering, Changwon National University) ;
  • Song, Tae Kwon (School of Advanced Materials and Engineering, Changwon National University) ;
  • Kim, Won-Jeong (Department of Physics, Changwon National University) ;
  • Sung, Yeon Soo (Department of Materials and Engineering, Technology (POSTECH)) ;
  • Kim, Myong-Ho (School of Advanced Materials and Engineering, Changwon National University)
  • 이재홍 (창원대학교 신소재공학부) ;
  • 이명환 (창원대학교 신소재공학부) ;
  • 송태권 (창원대학교 신소재공학부) ;
  • 김원정 (창원대학교 물리학과) ;
  • 성연수 (포항공과대학교 신소재공학과) ;
  • 김명호 (창원대학교 신소재공학부)
  • Received : 2016.11.28
  • Accepted : 2017.01.20
  • Published : 2017.03.27
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Abstract

The effects of an excess of Bi on the piezoelectric and dielectric properties of $0.60Bi_{1+x}FeO_3-0.40BaTiO_3$ (x = 0, 0.01, 0.03, 0.05, 0.07) were investigated. The ceramics were processed through a conventional solid state reaction method and then quenched after sintering at different temperatures in the range of $980{\sim}1070^{\circ}C$. A single perovskite structure without any secondary phase was confirmed for all compositions and temperatures. It was found that excess Bi reduced the sintering temperatures, acted as a sintering aid and enhanced the properties in combination with quenching. Curie temperature ($T_C$) was found to slightly increase due to the presence of excess Bi; electrical properties were also improved by quenching. At x = 0.03 and $1030^{\circ}C$, remnant polarization ($2P_r$) was as high as $45.4{\mu}C/cm^2$ and strain at 40 kV/cm was up to 0.176 %.

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References

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