한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제25권6호
  • /
  • Pages.486-490
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  • 2012
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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중·저온 영역 SOFC용 고체 전해질로의 응용을 위한 Bi가 첨가된 아파타이트형 란타늄 실리케이트의 전기적 특성

Electrical Properties of Bi-doped Apatite-type Lanthanum Silicates Materials for SOFCs

  • 김대영 (경상대학교 나노신소재공학부 세라믹공학과) ;
  • 정광호 (경상대학교 나노신소재공학부 세라믹공학과) ;
  • 이성갑 (경상대학교 나노신소재공학부 세라믹공학과)
  • Kim, Dae-Young (Department of Ceramic Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Jeong, Gwang-Ho (Department of Ceramic Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Sung-Gap (Department of Ceramic Engineering, Engineering Research Institute, Gyeongsang National University)
  • 투고 : 2012.04.02
  • 심사 : 2012.05.08
  • 발행 : 2012.06.01
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초록

$La_{7.33}Bi_2(SiO_4)_6O_2$ specimens were fabricated by standard solid-state synthesis route for solid oxide electrolytes. The calcined powders exhibited uniform particles with a mean particle size of about $28{\mu}m$. The room-temperature structure of $La_{7.33}Bi_2(SiO_4)_6O_2$ specimens was analyzed as hexagonal, space group P63 or P63/m, and the unit cell volume increased with increase a sintering temperature. The specimens sintered at $1,175^{\circ}C$ showed X-ray patterns of homogeneous apatite single phase without the second phase such as $La_2Si_2O_7$ and $La_2SiO_5$. The specimen sintered at $1,175^{\circ}C$ showed the maximum sintered density of 5.49 $g/cm^3$. Increasing the sintering temperature, total conductivities increased, activation energy decreased and the values were $1.98{\times}10^{-5}Scm-1$ and 1.23 eV, respectively.

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