Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Structural analysis and thermal expansion property of Cu doped LSM for SOFCs

Cu가 도핑된 LSM의 구조분석과 열팽창특성 연구

  • Noh, Tai-Min (School of Materials Science and Engineering, Pusan National University) ;
  • Ryu, Ji-Seung (National Core Research Center for Hybrid Materials Solution, Pusan National University) ;
  • Kim, Jin-Seong (School of Materials Science and Engineering, Pusan National University) ;
  • Jeong, Cheol-Weon (National Core Research Center for Hybrid Materials Solution, Pusan National University) ;
  • Lee, Hee-Soo (School of Materials Science and Engineering, Pusan National University)
  • 노태민 (부산대학교 재료공학부) ;
  • 류지승 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터) ;
  • 김진성 (부산대학교 재료공학부) ;
  • 정철원 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터) ;
  • 이희수 (부산대학교 재료공학부)
  • Received : 2011.07.06
  • Accepted : 2011.07.22
  • Published : 2011.08.31
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Abstract

The doping effect of Cu in the Sr-doped lanthan manganites (LSM) has been investigated in terms of structural analysis and thermal expansion coefficient (TEC). The $La_{0.8}Sr_{0.2}Mn_{1-x}Cu_xO_3$ ($0{\leq}x{\leq}0.3$) were prepared by solid state reaction method and their crystal structure and TEC were measured. A decrease in the lattice parameters and the TEC were observed with increase eu content, whereas they were decreased for x = 0.3. For $0{\leq}x{\leq}0.2$, the decrease of the lattice parameter and the TEC with increase Cu content were attributed to the reduction of ionic radius of Cu ions due to the presence of $Cu^{3+}$ ions. For x = 0.3, however, the increase was originated from the formation of oxygen vacancies due 10 the presence of $Cu^{2+}$ and $Mn^{4+}$.

이종 원자가를 가시는 Cu의 도핑이 LSM에 미치는 영향을 구조적인 분석과 열팽창계수를 통해서 고찰하였다. 고상반응을 이용하여 $La_{0.8}Sr_{0.2}Mn_{1-x}Cu_xO_3$($0{\leq}x{\leq}0.3$)음 제조하였으며, Cu의 도핑 함량에 따른 결정구조 및 열팽창계수를 확인하였다. Cu 함량이 증가함에 따라서 격자상수외 열팽창계수가 감소하는 경향을 나타냈지만, x = 0.3인 경우에는 증가 하였다. 이러한 격자상수와 열팽창계수의 변화는 Cu 이온의 B-site에서의 Mn 자리에 치환될 때 $0{\leq}x{\leq}0.2$의 범위에서는 $Cu^{3+}$의 존재로 인한 이온 반성의 감소에 의한 것으로 판단되었고, x=0.3인 경우에는 $Cu^{2+}$와 $Mn^{4+}$의 존재로 인한 산소 공공의 증가에 기인한 것이었다.

Keywords

References

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