Abstract
The compound Ba 3Y 4O 9 is stable in dry air. However, in moist air it decomposes below 1200°C into Y 2 O 3+ BaCO 3. The fast ionic conduction observed in the range 370°C< T<600°C is shown to occur in an immobilized-liquid state of an intermediate decomposition product Ba( OH) 2− BaO 2− x and/or a eutectic Ba( OH) 2−11 w/o BaCO 3.
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