Abstract
The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba 2Sc 2O 5 and cubic BaScO 3− δ ( δ ∼ 0.5) was studied. Both the tetragonal Ba 2Sc 2O 5 and cubic BaScO 3− δ absorbed water and formed Ba 2Sc 2O 5·0.60H 2O and BaScO 3− δ ·0.37H 2O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30–70 K lower than that for Ba 2In 2O 5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba 2Sc 2O 5 and cubic BaScO 3− δ was not observed. The Ba 2Sc 2O 5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere.
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