Abstract
The layer compound Bi 2UO 6 has been prepared by co-precipitation and subjected to powder x-ray diffraction, transmission electron microscopy, impedance spectroscopy, oxygen concentration cell and oxygen transport cell measurements. At 400°C in atmospheres of O 2 or N 2, ceramic samples displayed a bulk oxide ion conductivity of 10 −1 S cm −1, about an order of magnitude higher than that of other bismuth oxide-based compounds. However, because of grain boundary blocking, the overall conductivity of the ceramic was limited to 10 −2 S cm −1. At 475 to 600°C the concentration and transport cell measurements indicated mixed oxide ion/electronic conductivity. Possible mechanisms of oxide ion transport and of grain boundary blocking are discussed in relation to structure.
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