Synthesis, characterization and properties of nanocrystalline perovskite cathode materials

• Autorzy: Ghosh S. , Dasgupta S.
• Języki publikacji: EN

Abstrakty

EN

A simple low temperature synthesis route has been presented of preparing nanosized, single phased LaFeO3, La(1-x)SrxFeO3 (x = 0.3, 0.5) and La(1-x)SrxCo0.2Fe0.8O3 (x = 0.2, 0.4) for cathode applications in ITSOFC. A soft chemical method has been applied, using tartaric acid as a template material and nitric acid as an oxidizing agent. Phase pure materials were obtained at temperatures ranging from 550 °C to 700 °C. The synthesized powders were characterized by TGA, XRD, SEM and FTIR analysis. The crystallite size was 45-50 nm, with the surface area of 14-20 m2/g. Electronic conductivity of the material was found to increase upon increasing Sr concentration and the sintering temperature. High electronic conductivities of 355 S/cm and 545 S/cm were obtained at 400 °C for La0.5Sr0.5Fe2O3 and La0.6Sr0.4Co0.2Fe2O3, respectively. Activation energy decreases with the increase in Sr concentration. The values of thermal expansion coefficients (TEC) of the materials are compatible with the TEC of the ceria-gadolinium oxide CGO interlayer between cathode layer and electrolyte.

Słowa kluczowe

EN

electronic materials; X-ray diffraction; electrical conductivity

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2010
• Tom: Vol. 28, No. 2
• Strony: 427--438
• Opis fizyczny: Bibliogr. 31 poz.

Twórcy

autor

Ghosh S.

autor

Dasgupta S.

• Ceramic Membrane Division Central Glass and Ceramic Research Institute Council of Scientific and Industrial Research Kolkata 700 032 India

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