Phase constitution in Sr and Mg doped LaGaO 3 system

Feng Zheng, Rajendra K. Bordia, Larry R. Pederson

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    Sr and Mg doped lanthanum gallate perovskites (La 1-xSr xGa 1-yMg yO 3-δ, shortened as LSGM-XY where X and Y are the doping levels in mole percentage (mol%) at the La- or A-site and the Ga- or B-site, respectively) are promising electrolyte materials for intermediate temperature solid oxide fuel cells (SOFCs). In this study, we have investigated the primary perovskites as well as the secondary phases formed in terms of doping content changes and A/B ratio variations in these materials. Fifteen powder compositions (three doping levels, X=Y=0, 0.1, and 0.2mol; and five A/B ratios 0.95, 0.98, 1.00, 1.02, and 1.05) were synthesized by the glycine-nitrate combustion process (GNP). These powders were equilibrated by calcining at 1500°C for 9h prior to crystalline phase characterization by X-ray powder diffraction (XRD). From the results of this study and the available phase diagrams in the literature on constituent binary oxide systems, we propose a crystalline phase diagram of the La 2O 3-SrO-Ga 2O 3-MgO quaternary system at elevated temperature (1500°C).

    Original languageEnglish
    Pages (from-to)141-155
    Number of pages15
    JournalMaterials Research Bulletin
    Issue number1
    Publication statusPublished - 3 Jan 2004



    • A. Oxides
    • C. X-ray diffraction
    • D Ionic conductivity
    • D. Crystal structure
    • D. Phase equilibria

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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