Electrical Conduction Behavior of La 1+ x Sr 1− x Ga 3 O 7–δ Melilite‐Type Ceramics

Ceramics of the melilite‐type compound La 1+ x Sr 1− x Ga 3 O 7−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. La 1+ x Sr 1− x Ga 3 O 7−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.