Electrical Conduction Behavior of La1+xSr1−xGa3O7–δ Melilite-Type Ceramics |
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Authors: | Michael Rozumek,Peter Majewski,Heike Schluckwerder,Fritz Aldinger ,Klaus Kü nstler,Gerhard Tomandl |
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Affiliation: | Pulvermetallurgisches Laboratorium, Max-Planck-Institut für Metallforschung, D-70569 Stuttgart, Germany;Institut für Keramische Werkstoffe, Technical University Bergakademie Freiberg, D-09596 Freiberg, Germany |
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Abstract: | Ceramics of the melilite-type compound La1+ x Sr1− x Ga3O7−δ were prepared by conventional ceramic processing. Samples prepared represented the entire homogeneity region of the phase (i.e., x =−0.15 to 0.60). Electrochemical characterization under variable temperature and atmospheric conditions in the vicinity of air entailed four-point direct-current conductivity measurements and electromotive force measurements. La1+ x Sr1− x Ga3O7−δ samples exhibited a p -type behavior with generally increased conductivity with increased substitution of lanthanum for strontium, which reached a saturation value of ∼10−1 S·cm−1 at 950°C. |
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Keywords: | melilite electrochemistry solid oxide fuel cell gallium/gallium compounds |
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