• 제목/요약/키워드: $(La,Sr)MnO_3$

검색결과 205건 처리시간 0.025초

저온 고체산화물 연료전지용 공기극 미세구조 제어 및 성능개선 (Cathode Microstructure Control and Performance Improvement for Low Temperature Solid Oxide Fuel Cells)

  • 강중구;김진수;윤성필
    • 한국세라믹학회지
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    • 제44권12호
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    • pp.727-732
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    • 2007

  • In order to fabricate a highly performing cathode for low-temperature type solid oxide fuel cells working at below $700^{\circ}C$, electrode microstructure control and electrode polarization measurement were performed with an electronic conductor, $La_{0.8}Sr_{0.2}MnO_3$ (LSM) and a mixed conductor, $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$(LSCF). For both cathode materials, when $Sm_{0.2}Ce_{0.8}O_2$ (SDC) buffer layer was formed between the cathode and yttria-stabilized zirconia (YSZ) electrolyte, interfacial reaction products were effectively prevented at the high temperature of cathode sintering and the electrode polarization was also reduced. Moreover, cathode polarization was greatly reduced by applying the SDC sol-gel coating on the cathode pore surface, which can increase triple phase boundary from the electrolyte interface to the electrode surface. For the LSCF cathode with the SDC buffer layer and modified by the SDC sol-gel coating on the cathode pore surface, the cathode resistance was as low as 0.11 ${\Omega}{\cdot}cm^2$ measured at $700^{\circ}C$ in air atmosphere.

  • https://doi.org/10.4191/KCERS.2007.44.1.727 인용 PDF KSCI

Cu가 도핑된 LSM의 구조분석과 열팽창특성 연구 (Structural analysis and thermal expansion property of Cu doped LSM for SOFCs)

  • 노태민;류지승;김진성;정철원;이희수
    • 한국결정성장학회지
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    • 제21권4호
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    • pp.175-180
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    • 2011

  • 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.

  • https://doi.org/10.6111/JKCGCT.2011.21.4.175 인용 PDF KSCI

Structure and magnetic properties of CrN thin films on La0.67Sr0.33MnO3

  • Zhang, Dingbo;Zhou, Zhongpo;Wang, Haiying;Wang, Tianxing;Lu, Zhansheng;Yang, Zongxian;Ai, Zhiwei;Wu, Hao;Liu, Chang
    • Current Applied Physics
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    • 제18권11호
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    • pp.1320-1326
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    • 2018

  • High crystalline quality CrN thin films have been grown on $La_{0.67}Sr_{0.33}MnO_3$ (LSMO) templates by molecular beam epitaxy. The structure and magnetic properties of CrN/LSMO heterojunctions are investigated combining with the experiments and the first-principles simulation. The N?el temperature of the CrN/LSMO samples is found to be 281 K and the saturation magnetization of CrN/LSMO increases compared to that of LSMO templates. The magnetic property of CrN/LSMO heterostructures mainly comes from Cr atoms of (001) CrN and Mn atoms of (001) LSMO. The (001) LSMO induces and couples the spin of the CrN sublattice at CrN/LSMO interface.

  • https://doi.org/10.1016/j.cap.2018.07.012 인용 KSCI