Synthesis of mixed conducting oxides by an organic steric entrapment method

W. M. Kriven, B. R. Rosczyk, M. I. Bertoni, Thomas O. Mason

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Three compounds currently of interest as solid oxide fuel cell components (SOFC's) have been synthesized by the organic steric entrapment method. They were doped lanthanum gallate (La0.8Sr0.2Ga0.83Mg0.17O 0.2815) or "LSGM", samarium doped, cerium oxide (Ce0.8Sm0.2O2-δ) and strontium iron cobaltite (SrFeCo0.5O3-δ). While XRD results indicated that the Ce0.8Sm0.2O2-δ, SrFeCo0.5Ox and LSGM specimens were single phase, SEM observations showed the presence of a grain boundary phase homogeneously surrounding grains in the LSGM specimen. Pellets of LSGM were measured by AC impedance spectroscopy, yielding reliable data in the temperature range from 340°C to 830°C. Some degree of microcracking was also observed in the LSGM microstructure which is most likely responsible for the reduced conductivities vis-à-vis the best literature values. The LSGM here fabricated was fine grained (∼4 μm in diameter) as compared to the ∼15μm of previous literature such that grain boundaries will play a more dominant role. Elongated grains were clearly present in the SrFeCo0.5Ox microstructure.

Original languageEnglish
Pages (from-to)287-292
Number of pages6
JournalCeramic Engineering and Science Proceedings
Volume24
Issue number3
Publication statusPublished - Dec 9 2003
EventCeramic Engineering And Science Proceedings: 27th International Cocoa Beach Conference on Advanced Ceramics and Composites:A - Cocoa Beach, FL, United States
Duration: Jan 26 2003Jan 31 2003

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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